I was actually pretty surprised at how much difficulty they all appeared to have with relatively light weights. I’m sure Lebron is pretty strong, but he didn’t look that sharp on the Kettlebell presses or the light RDL, and Kobe appeared to be having a hell of a time on Incline with what couldn’t have been more than 55#.
Bear in mind, they are probably stronger than their lift #s show. At their height, that is a lot further to push every weight.
I’d think you could develop fast twitch arm strength using some sort of upper body plyos. (I’ve never read or tried that, but would stand to reason)..