Kettlebells

So I've been lifting weights for over twenty years, I'm in pretty good shape but lack strength and flexibility in the support muscles and tendons. I recently made a sad attempt at learning Jiu Jitsu, it was then that my "bar body" was pointed out to me. A bar body is when someone looks pretty strong but really just has defined pecs, triceps, biceps and delts so they look good sitting at the bar.

I started doing some research and found that a kettlebell workout in addition to weight lifting helps make all of the muscles and tendons as strong as the show muscles. Yoga would probably do the same thing but I've tried kettlebells and they're fun.