         physicsWorld.gravity = CGVector(dx: 0, dy: 0)
         let gravityVec = vector_float3(0, -1, 0)
         let gravityNode = SKFieldNode.linearGravityField(withVector: gravityVec)
-        gravityNode.strength = 1.0
+        gravityNode.strength = 1.5
         addChild(gravityNode)
         
         //Confine Skier (Border physics)

    
    func moveBackground(){
        
        if (background1.position.y <= -background1.size.height / 2){
            background1.position = CGPoint(x: frame.width / 2, y: background2.position.y + frame.height)
            return
        }
        
        background1.position = CGPoint(x: Int(background1.position.x), y: Int(background1.position.y) - scrollSpeed)
        
        
        if (background2.position.y <= -background1.size.height / 2){
            background2.position = CGPoint(x: frame.width / 2, y: background1.position.y + frame.height)
            return
            
        }
        
        background2.position = CGPoint(x: Int(background1.position.x), y: Int(background2.position.y) - scrollSpeed)
        
        
    }

        background2.size = frame.size
        
        background1.position = CGPoint(x: frame.width / 2, y: frame.height / 2 )
        background2.position = CGPoint(x: frame.width / 2, y: -frame.height / 2 )
        
        addChild(background1)
        addChild(background2)
