Smooth a Value

moveAnim = moveDelta * (Running ? 2 : 1);

So look when running is true return 2 to moveAnim and how can i make that this moveAnim goes smoother into 2

Several ways of doing this. Have a look at Mathf class. There is Lerp, SmoothStep, MoveTowards.

In your case without seeing any code showing the context. Then try MoveTowards.