diff --git a/backend/src/helper/delta-time-calculator.ts b/backend/src/helper/delta-time-calculator.ts
new file mode 100644
index 0000000..ebf75f5
--- /dev/null
+++ b/backend/src/helper/delta-time-calculator.ts
@@ -0,0 +1,12 @@
+export class DeltaTimeCalculator {
+  private previousTime: [number, number] = process.hrtime();
+
+  public getNextDeltaTimeInMilliseconds(): number {
+    const deltaTime = process.hrtime(this.previousTime);
+    this.previousTime = process.hrtime();
+
+    const [seconds, nanoSeconds] = deltaTime;
+
+    return seconds * 1000 + nanoSeconds / 1000 / 1000;
+  }
+}
diff --git a/backend/src/main.ts b/backend/src/main.ts
index dbe0f6c..1e90611 100644
--- a/backend/src/main.ts
+++ b/backend/src/main.ts
@@ -2,12 +2,19 @@ import ioserver, { Socket } from 'socket.io';
 import express from 'express';
 import { Server } from 'http';
 import cors from 'cors';
-import { applyArrayPlugins, Random, TransportEvents, deserializeCommand } from 'shared';
+import {
+  applyArrayPlugins,
+  Random,
+  TransportEvents,
+  deserializeCommand,
+  StepCommand,
+} from 'shared';
 import './index.html';
 import { Player } from './players/player';
 import { PhysicalContainer } from './physics/containers/physical-container';
 import { createDungeon } from './map/create-dungeon';
 import { glMatrix } from 'gl-matrix';
+import { DeltaTimeCalculator } from './helper/delta-time-calculator';
 
 glMatrix.setMatrixArrayType(Array);
 
@@ -26,6 +33,8 @@ objects.initialize();
 
 const app = express();
 
+const deltaTimeCalculator = new DeltaTimeCalculator();
+
 app.use(
   cors({
     origin: (origin, callback) => {
@@ -50,7 +59,6 @@ app.get('/', function (req, res) {
 io.on('connection', (socket: SocketIO.Socket) => {
   socket.on(TransportEvents.PlayerJoining, () => {
     const player = new Player(objects, socket);
-
     socket.on(TransportEvents.PlayerToServer, (text: string) => {
       const command = deserializeCommand(JSON.parse(text));
       player.sendCommand(command);
@@ -71,3 +79,14 @@ io.on('connection', (socket: SocketIO.Socket) => {
 server.listen(port, () => {
   console.log(`server started at http://localhost:${port}`);
 });
+
+const handlePhysics = () => {
+  const delta = deltaTimeCalculator.getNextDeltaTimeInMilliseconds();
+  const step = new StepCommand(delta);
+
+  objects.sendCommand(step);
+
+  setTimeout(handlePhysics, 5);
+};
+
+handlePhysics();
diff --git a/backend/src/objects/character-physical.ts b/backend/src/objects/character-physical.ts
index c5ca448..3c3204d 100644
--- a/backend/src/objects/character-physical.ts
+++ b/backend/src/objects/character-physical.ts
@@ -1,27 +1,64 @@
 import { vec2 } from 'gl-matrix';
-import { id, CharacterBase } from 'shared';
+import {
+  id,
+  CharacterBase,
+  StepCommand,
+  settings,
+  CommandExecutors,
+  MoveActionCommand,
+} from 'shared';
 
 import { ImmutableBoundingBox } from '../physics/bounding-boxes/immutable-bounding-box';
 
 import { CirclePhysical } from './circle-physical';
 import { Physical } from '../physics/physical';
+import { PhysicalContainer } from '../physics/containers/physical-container';
 
 export class CharacterPhysical extends CharacterBase implements Physical {
   public readonly canCollide = true;
   public readonly isInverted = false;
   public readonly canMove = true;
 
+  public head: CirclePhysical;
+  public leftFoot: CirclePhysical;
+  public rightFoot: CirclePhysical;
+
+  private movementActions: Array<MoveActionCommand> = [];
+
+  protected commandExecutors: CommandExecutors = {
+    [StepCommand.type]: this.step.bind(this),
+    [MoveActionCommand.type]: (c: MoveActionCommand) => this.movementActions.push(c),
+  };
+
   private static readonly headOffset = vec2.fromValues(0, 40);
   private static readonly leftFootOffset = vec2.fromValues(-20, -10);
   private static readonly rightFootOffset = vec2.fromValues(20, -10);
 
-  constructor() {
+  constructor(container: PhysicalContainer) {
     super(
       id(),
-      new CirclePhysical(vec2.clone(CharacterPhysical.headOffset), 50, null),
-      new CirclePhysical(vec2.clone(CharacterPhysical.leftFootOffset), 20, null),
-      new CirclePhysical(vec2.clone(CharacterPhysical.rightFootOffset), 20, null)
+      new CirclePhysical(vec2.clone(CharacterPhysical.headOffset), 50, null, container),
+      new CirclePhysical(
+        vec2.clone(CharacterPhysical.leftFootOffset),
+        20,
+        null,
+        container
+      ),
+      new CirclePhysical(
+        vec2.clone(CharacterPhysical.rightFootOffset),
+        20,
+        null,
+        container
+      )
     );
+
+    this.head.owner = this;
+    this.leftFoot.owner = this;
+    this.rightFoot.owner = this;
+
+    container.addObject(this.head);
+    container.addObject(this.leftFoot);
+    container.addObject(this.rightFoot);
   }
 
   private _boundingBox?: ImmutableBoundingBox;
@@ -42,16 +79,51 @@ export class CharacterPhysical extends CharacterBase implements Physical {
   public distance(_: vec2): number {
     return 0;
   }
-  /*
-  public step() {
-    const movementForce = vec2.fromValues(right - left, up - down);
+
+  private sumAndResetMovementActions(): vec2 {
+    if (this.movementActions.length === 0) {
+      return vec2.create();
+    }
+
+    const movementForce = this.movementActions.reduce(
+      (sum, current) => vec2.add(sum, sum, current.delta),
+      vec2.create()
+    );
+
+    vec2.scale(movementForce, movementForce, 1 / this.movementActions.length);
+
+    this.movementActions = [];
+
+    return movementForce;
+  }
+
+  public step(c: StepCommand) {
+    const deltaTime = c.deltaTimeInMiliseconds;
+
+    const movementForce = this.sumAndResetMovementActions();
+    if (!this.leftFoot.isAirborne || !this.rightFoot.isAirborne) {
+      movementForce.y = 0;
+    }
+
     this.head.applyForce(movementForce, deltaTime);
     this.head.applyForce(settings.gravitationalForce, deltaTime);
 
-    const bodyCenter = vec2.sub(vec2.create(), this.head.center, this.headOffset);
+    const bodyCenter = vec2.sub(
+      vec2.create(),
+      this.head.center,
+      CharacterPhysical.headOffset
+    );
 
-    const leftFootPositon = vec2.add(vec2.create(), bodyCenter, this.leftFootOffset);
-    const rightFootPositon = vec2.add(vec2.create(), bodyCenter, this.rightFootOffset);
+    const leftFootPositon = vec2.add(
+      vec2.create(),
+      bodyCenter,
+      CharacterPhysical.leftFootOffset
+    );
+    const rightFootPositon = vec2.add(
+      vec2.create(),
+      bodyCenter,
+      CharacterPhysical.rightFootOffset
+    );
 
     const leftFootDelta = vec2.sub(vec2.create(), this.leftFoot.center, leftFootPositon);
     const rightFootDelta = vec2.sub(
@@ -80,13 +152,13 @@ export class CharacterPhysical extends CharacterBase implements Physical {
     this.leftFoot.step(deltaTime);
     this.rightFoot.step(deltaTime);
 
-    this.flashlight.center = vec2.add(
+    /*this.flashlight.center = vec2.add(
       vec2.create(),
       this.head.center,
       vec2.fromValues(0, 0)
-    );
+    );*/
   }
-*/
+
   public toJSON(): any {
     const { type, id, head, leftFoot, rightFoot } = this;
     return [type, id, head, leftFoot, rightFoot];
diff --git a/backend/src/objects/circle-physical.ts b/backend/src/objects/circle-physical.ts
index 32e3f86..45df3df 100644
--- a/backend/src/objects/circle-physical.ts
+++ b/backend/src/objects/circle-physical.ts
@@ -1,9 +1,18 @@
 import { vec2 } from 'gl-matrix';
-import { Circle, clamp, GameObject, settings } from 'shared';
+import {
+  Circle,
+  clamp,
+  CommandExecutors,
+  GameObject,
+  settings,
+  StepCommand,
+} from 'shared';
 import { Physical } from '../physics/physical';
 
 import { BoundingBox } from '../physics/bounding-boxes/bounding-box';
 import { BoundingBoxBase } from '../physics/bounding-boxes/bounding-box-base';
+import { moveCircle } from '../physics/move-circle';
+import { PhysicalContainer } from '../physics/containers/physical-container';
 
 export class CirclePhysical implements Circle, Physical {
   readonly isInverted = false;
@@ -18,9 +27,18 @@ export class CirclePhysical implements Circle, Physical {
     return this._isAirborne;
   }
 
+  protected commandExecutors: CommandExecutors = {
+    [StepCommand.type]: this.step.bind(this),
+  };
+
   private _boundingBox: BoundingBox;
 
-  constructor(private _center: vec2, private _radius: number, private owner: GameObject) {
+  constructor(
+    private _center: vec2,
+    private _radius: number,
+    public owner: GameObject,
+    private readonly container: PhysicalContainer
+  ) {
     this._boundingBox = new BoundingBox(null);
     this.recalculateBoundingBox();
   }
@@ -59,11 +77,11 @@ export class CirclePhysical implements Circle, Physical {
     return vec2.distance(target.center, this.center) - this.radius - target.radius;
   }
 
-  public areIntersecting(other: CirclePhysical): boolean {
+  public areIntersecting(other: Physical): boolean {
     return other.distance(this.center) < this.radius;
   }
 
-  public isInside(other: CirclePhysical): boolean {
+  public isInside(other: Physical): boolean {
     return other.distance(this.center) < -this.radius;
   }
 
@@ -105,12 +123,13 @@ export class CirclePhysical implements Circle, Physical {
     this.velocity = vec2.create();
   }
 
-  /*public step(timeInMilliseconds: number): boolean {
+  public step(timeInMilliseconds: number): boolean {
     vec2.scale(
       this.velocity,
       this.velocity,
       Math.pow(settings.velocityAttenuation, timeInMilliseconds)
     );
+
     const distance = vec2.scale(vec2.create(), this.velocity, timeInMilliseconds);
     const distanceLength = vec2.length(distance);
     const stepCount = Math.ceil(distanceLength / settings.physicsMaxStep);
@@ -119,22 +138,21 @@ export class CirclePhysical implements Circle, Physical {
     let wasHit = false;
 
     for (let i = 0; i < stepCount; i++) {
-      const { normal, tangent, hitSurface } = this.physics.tryMovingDynamicCircle(
+      const { normal, tangent, hitSurface } = moveCircle(
         this,
-        distance
+        distance,
+        this.container.findIntersecting(this.boundingBox)
       );
       if (hitSurface) {
         vec2.scale(this.velocity, tangent, vec2.dot(tangent, this.velocity));
         wasHit = true;
       }
 
-      this._isAirborne = !(
-        hitSurface && vec2.dot(normal, settings.gravitationalForce) < 0
-      );
+      this._isAirborne = hitSurface;
     }
 
     return wasHit;
-  }*/
+  }
 
   public toJSON(): any {
     const { center, radius } = this;
diff --git a/backend/src/physics/containers/physical-container.ts b/backend/src/physics/containers/physical-container.ts
index 2ce9ba4..61b7a56 100644
--- a/backend/src/physics/containers/physical-container.ts
+++ b/backend/src/physics/containers/physical-container.ts
@@ -71,7 +71,7 @@ export class PhysicalContainer {
 
   private createGroupForCommand(commandType: string) {
     const objectsReactingToCommand = [];
-
+    console.log(commandType);
     this.objects.forEach((o, _) => {
       if (o.reactsToCommand(commandType)) {
         objectsReactingToCommand.push(o);
diff --git a/backend/src/physics/move-circle.ts b/backend/src/physics/move-circle.ts
index dc6aa83..d152c57 100644
--- a/backend/src/physics/move-circle.ts
+++ b/backend/src/physics/move-circle.ts
@@ -1,12 +1,12 @@
-/*import { vec2 } from 'gl-matrix';
-import { rotate90Deg } from 'shared';
-import { CirclePhysics } from './bounds/circle-physics';
-import { PhysicalGameObject } from './physical-game-object';
+import { vec2 } from 'gl-matrix';
+import { rotate90Deg, settings } from 'shared';
+import { CirclePhysical } from '../objects/circle-physical';
+import { Physical } from './physical';
 
 export const moveCircle = (
-  circle: CirclePhysics,
+  circle: CirclePhysical,
   delta: vec2,
-  possibleIntersectors: Array<PhysicalGameObject>
+  possibleIntersectors: Array<Physical>
 ): {
   realDelta: vec2;
   hitSurface: boolean;
@@ -16,7 +16,7 @@ export const moveCircle = (
   circle.center = vec2.add(circle.center, circle.center, delta);
 
   const intersecting = possibleIntersectors.filter(
-    (b) => b !== circle && circle.areIntersecting(b) && b.canCollide
+    (b) => b.gameObject !== circle.gameObject && circle.areIntersecting(b) && b.canCollide
   );
 
   if (intersecting.length === 0) {
@@ -34,7 +34,7 @@ export const moveCircle = (
       closest: intersecting
         .map((i) => ({
           inverted: i.isInverted,
-          distance: i.owner.distance(point),
+          distance: i.distance(point),
         }))
         .sort((a, b) => a.distance - b.distance)[0],
     }))
@@ -79,4 +79,3 @@ export const moveCircle = (
     tangent: rotate90Deg(approxNormal),
   };
 };
-*/
diff --git a/backend/src/players/player.ts b/backend/src/players/player.ts
index 0517b65..a9f5b49 100644
--- a/backend/src/players/player.ts
+++ b/backend/src/players/player.ts
@@ -21,7 +21,7 @@ import { jsonSerialize } from '../serialize';
 export class Player extends CommandReceiver {
   public isActive = true;
 
-  private character: CharacterPhysical = new CharacterPhysical();
+  private character: CharacterPhysical;
 
   private objectsPreviouslyInViewArea: Array<Physical> = [];
   private objectsInViewArea: Array<Physical> = [];
@@ -30,12 +30,8 @@ export class Player extends CommandReceiver {
     [SetViewAreaActionCommand.type]: this.setViewArea.bind(this),
     [MoveActionCommand.type]: (c: MoveActionCommand) => {
       vec2.normalize(c.delta, c.delta);
-      vec2.scale(c.delta, c.delta, 40);
-      this.character.head.center = vec2.add(
-        this.character.head.center,
-        this.character.head.center,
-        c.delta
-      );
+      vec2.scale(c.delta, c.delta, 15);
+      this.character.sendCommand(c);
     },
   };
 
@@ -46,6 +42,7 @@ export class Player extends CommandReceiver {
     private readonly socket: SocketIO.Socket
   ) {
     super();
+    this.character = new CharacterPhysical(objects);
     this.objectsPreviouslyInViewArea.push(this.character);
     this.objectsInViewArea.push(this.character);
 
@@ -82,7 +79,9 @@ export class Player extends CommandReceiver {
       this.socket.emit(
         TransportEvents.ServerToPlayer,
         jsonSerialize(
-          new DeleteObjectsCommand(noLongerIntersecting.map((p) => p.gameObject.id))
+          new DeleteObjectsCommand([
+            ...new Set(noLongerIntersecting.map((p) => p.gameObject.id)),
+          ])
         )
       );
     }
@@ -92,7 +91,7 @@ export class Player extends CommandReceiver {
         TransportEvents.ServerToPlayer,
         jsonSerialize(
           new CreateObjectsCommand(
-            jsonSerialize(newlyIntersecting.map((p) => p.gameObject))
+            jsonSerialize([...new Set(newlyIntersecting.map((p) => p.gameObject))])
           )
         )
       );
@@ -102,7 +101,11 @@ export class Player extends CommandReceiver {
       TransportEvents.ServerToPlayer,
       jsonSerialize(
         new UpdateObjectsCommand(
-          jsonSerialize(this.objectsInViewArea.filter((o) => o.canMove))
+          jsonSerialize([
+            ...new Set(
+              this.objectsInViewArea.filter((p) => p.canMove).map((p) => p.gameObject)
+            ),
+          ])
         )
       )
     );
diff --git a/frontend/src/scripts/game.ts b/frontend/src/scripts/game.ts
index 50483a1..4865042 100644
--- a/frontend/src/scripts/game.ts
+++ b/frontend/src/scripts/game.ts
@@ -15,6 +15,7 @@ import {
   prettyPrint,
   settings,
   SetViewAreaActionCommand,
+  StepCommand,
   TransportEvents,
 } from 'shared';
 import io from 'socket.io-client';
@@ -23,7 +24,6 @@ import { MouseListener } from './commands/generators/mouse-listener';
 import { TouchListener } from './commands/generators/touch-listener';
 import { CommandReceiverSocket } from './commands/receivers/command-receiver-socket';
 import { RenderCommand } from './commands/types/render';
-import { StepCommand } from './commands/types/step';
 import { Configuration } from './config/configuration';
 import { DeltaTimeCalculator } from './helper/delta-time-calculator';
 import { rgb } from './helper/rgb';
@@ -142,7 +142,7 @@ export class Game {
   }
 
   private gameLoop(time: DOMHighResTimeStamp) {
-    const deltaTime = this.deltaTimeCalculator.getNextDeltaTime(time);
+    const deltaTime = this.deltaTimeCalculator.getNextDeltaTimeInMilliseconds(time);
     this.keyboardListener.generateCommands();
 
     if (this.gameObjects.camera) {
diff --git a/frontend/src/scripts/helper/delta-time-calculator.ts b/frontend/src/scripts/helper/delta-time-calculator.ts
index fb7686d..f616553 100644
--- a/frontend/src/scripts/helper/delta-time-calculator.ts
+++ b/frontend/src/scripts/helper/delta-time-calculator.ts
@@ -5,7 +5,9 @@ export class DeltaTimeCalculator {
     document.addEventListener('visibilitychange', this.handleVisibilityChange.bind(this));
   }
 
-  public getNextDeltaTime(currentTime: DOMHighResTimeStamp): DOMHighResTimeStamp {
+  public getNextDeltaTimeInMilliseconds(
+    currentTime: DOMHighResTimeStamp
+  ): DOMHighResTimeStamp {
     if (this.previousTime === null) {
       this.previousTime = currentTime;
     }
diff --git a/frontend/src/scripts/objects/game-object-container.ts b/frontend/src/scripts/objects/game-object-container.ts
index 99459f7..20680b2 100644
--- a/frontend/src/scripts/objects/game-object-container.ts
+++ b/frontend/src/scripts/objects/game-object-container.ts
@@ -7,9 +7,9 @@ import {
   DeleteObjectsCommand,
   GameObject,
   Id,
+  StepCommand,
   UpdateObjectsCommand,
 } from 'shared';
-import { StepCommand } from '../commands/types/step';
 import { deserialize, deserializeJsonArray } from '../transport/deserialize';
 import { Camera } from './camera';
 import { CharacterView } from './character-view';
diff --git a/shared/firebase.json b/shared/firebase.json
deleted file mode 100644
index 2c33c29..0000000
--- a/shared/firebase.json
+++ /dev/null
@@ -1,16 +0,0 @@
-{
-  "hosting": {
-    "public": "dist",
-    "ignore": [
-      "firebase.json",
-      "**/.*",
-      "**/node_modules/**"
-    ],
-    "rewrites": [
-      {
-        "source": "**",
-        "destination": "/index.html"
-      }
-    ]
-  }
-}
diff --git a/frontend/src/scripts/commands/types/step.ts b/shared/src/commands/types/step.ts
similarity index 83%
rename from frontend/src/scripts/commands/types/step.ts
rename to shared/src/commands/types/step.ts
index f10f9fb..ba62a0e 100644
--- a/frontend/src/scripts/commands/types/step.ts
+++ b/shared/src/commands/types/step.ts
@@ -1,4 +1,4 @@
-import { Command } from 'shared';
+import { Command } from '../command';
 
 export class StepCommand extends Command {
   public static readonly type = 'StepCommand';
diff --git a/shared/src/main.ts b/shared/src/main.ts
index b1ce9ae..4480f84 100644
--- a/shared/src/main.ts
+++ b/shared/src/main.ts
@@ -3,6 +3,7 @@ export * from './commands/types/create-objects';
 export * from './commands/types/create-player';
 export * from './commands/types/delete-objects';
 export * from './commands/types/update-objects';
+export * from './commands/types/step';
 export * from './commands/types/ternary-action';
 export * from './commands/types/move-action';
 export * from './commands/types/set-view-area-action';
diff --git a/shared/src/settings.ts b/shared/src/settings.ts
index e3c10a0..8628145 100644
--- a/shared/src/settings.ts
+++ b/shared/src/settings.ts
@@ -5,9 +5,9 @@ export const settings = {
   hitDetectionCirclePointCount: 32,
   hitDetectionMaxOverlap: 0.01,
   physicsMaxStep: 5,
-  gravitationalForce: vec2.fromValues(0, -0.015),
+  gravitationalForce: vec2.fromValues(0, -0.005),
   maxVelocityX: 1.5,
-  maxVelocityY: 8,
-  velocityAttenuation: 0.99,
+  maxVelocityY: 20,
+  velocityAttenuation: 0.98,
   inViewAreaSize: 1920 * 1080 * 3,
 };