Great. This will help him play basketball better underwater. That’s about it.
You seriously can't think of how such exercise might help his cardiovascular system? Really?
Just that the point being Jaylen doesn't need improvement in cardiovascular endurance or leg strength and jumping ability. He has those down pat. I'm not hung up on him improving "his handle" either. Looks to me like he handles the ball well. But even Globe-Trotter Curly Neal couldn't dribble through three defenders at once the way Brown attempts to do repeatedly.
It is Jaylen's decision making that is the problem, as well as Tatum and Smart. If those three guys could significantly improve their court awareness, getting rid of the ball early and not panicking in close games, it would go a long way towards improving this team.
Personally, I think they would also benefit greatly from a more creative offense with more variety and more off-ball player movement. As is, we grind down into stagnant half-court sets that only become more difficult to execute as a playoff series is extended.