Timing is a brain effort.....What's important is when the front foot goes down, not up......If the body is moving efficiently, the brain will know when to put the front foot down whether the pitch is fastball or offspeed.....It's about learning to move the middle properly (weight shift momentum and rotation).......And, it won't work without connection by the hands and arms.....There is no rotation without connection......When the hands and arms go independent and lose the connection with the shoulders, the link is broken and the rotation stops......