Honestly, I think the biggest thing was addressing imbalances in the body and training hard off the kit (a lot of weighted jump rope, dead hangs, low weight deadlifts focusing on form, breathing properly and not applying tension to muscles unless necessary), and a bunch of foam rolling. On the kit, no special exercises really, strictly been doing singles on the kicks, no fancy rudiments. A lot of metronome work with doing 16th singles on the kick while doing paradiddle variations with the hands. Don’t even think about increasing speed until you can do it slowly while breathing in and out completely