well you can start off by building up your strength base
by doing full back squats and deadlifts.
I would choose deadlifts if you only need one exercise, since its more VJ specific. Hammies and butt are more important. Do it slowly though especially the negative. 1-2 secs up, and 4 second down. Keep your lower back slightly arched, and head up. push through your heels.
You also need one single leg exercise. Do the reverse lunge. Good for balance too. Works the hamstrings especially hard. Sports performance always improves with reverse lunges.
Use either a bar or dumbells. Bodyweight is plenty to start off with.
the above are good for general strength. For explosive power.
use 30% of your one rep max for squats and do squat jumps.
Use the same depth as your normal VJ and jump continously spending as little time as possible of the ground.
Work you abs hard. Very important
Also do some calf raises, and basic upper body work. Work on your shoulders and external rotatry cuffs. hanging on the ring is tough on the cuffs
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Don't worry about the internal cuffs. they get plenty of work from normal chest and back work.
Oh yeah stretch your ext cuffs as well. stick you elbow out the side, with your fist on your waist, palms facing back, pull your elbow forward with your other hand
see here for exercises and how to do em.
http://strengthtraining.asimba.com/fitness_info/index.html
as always start off light and slow. learn the correct technique. always use a slow negative - 4 seconds, and use a controlled 2 second lift. I would keep the reps around 6-10. For calves use 6 reps per set, and explode the lift but lower it in 4 seconds since their mainly fast twitch.
I would do the Squat jumps first, and then either squats or deadlifts. I wouldn't do both of em. You can alternate between for each workout if you want or just stick to deadlifts. After that do the reverse lunges and calf raises.
Then work the rest of your body.
I'm trying to simplify things here. Training is a lot more complex than that. My head hurts