Hey guys you seem real helpful i'd just like to ask some questions. I bought this book NBA power conditioning and it has all these mad programs for speed, strength, jumping etc. Well i'm doing the strength base program so i can go onto polymetrics program and i've been doing the program for about 4 weeks now and i've seen some gains in my two footed jump. About maybe 3inches inches which is alright i guess but it seems that my 1 legged jump ( i get much higher on my one legged jump about 31inches, my two footed jump with no run up about 26inches run up about 28 inches) i haven't seen any results my 1 legged jump has been the same. Ive been doing hack squats ( dont like doing normal squats until i grow more i'm only 15 and 5"10 i know it doesn't stunt your growth i just dont want to decompress my spine so i have to keep doing stretches to lengthen it) and just basic things calf rasies, back extensions, bicep curls etc etc. I just want to know if only polymetrics increases your 1 legged jump becuase 1 legged jumps rely more on your tendons and things. Will i see gains in my 1 legged jump after a couple of more weeks? The first 6 weeks are on increasing muscle mass so its high reps then the last 6 weeks have lower reps about 6 reps per set. I guess thats when i get power and explosiveness but i'm just not really sure can you guys help me out?? Sorry for typing too much thanks alot!!!