As I now believe Jackson will be an over achiever :-), I figured I'd start him early with tummy time. Since he already has pretty good head control I figured he should pick this up fairly easily. I quickly found out he'd rather lay and relax as opposed to lifting himself up. Maybe he was tired but after 10 min of trying to get him to lift his head he wouldn't move.
He did however get excited with back time. He actually started hitting the ball above him, altough I don't think he knew what he was actually doing.:-)