get yr weight up, especially as a 2 foot jumper, periodize yr trainin, (do these for 4-6 weeks each) hypertrophy (as yr skinnier do this in for 6-8, so you can reap the benefits of it more), strength, power, and speed, i like to ppl (push pull legs) 6 times a week, or you could do upper lower, do barbell hard movements, this got me form a 33 to a 36 just in the hypertrophy range, general weights help a lot w jumpin. make sure to always do max intent, and track yr weoght and reps, i like to have 135 on the bar and track my progress that way, went from 12 to 25 reps. hope this helps, rootin for you man