I broke my knee cap last year and am just getting close to 100%. my physical therapist has had me warming up cycling then doing a rigorous jumping routine that is working wonders for me. Tuck jumps, box jumps, and triple jumps. lots of sets of them, 2 legged then one legged (bad leg for me). then 6 flights of 9 stairs 1 legged hops non stop. then back to the bottom, then same thing 2 stairs at a time one legged, then 3 stairs at a time one legged. leg press is great too, as is using a total gym and using for jumping with decresed impact and weight. they all strengthen butt, hips, hams, quads and calfs etc. also help with being real explosive. I feel like any kind of vertical climbing is great too, like steep hikes or running/biking on hills. you can google any of those exercises too if you don't know what they are