Who says I sit only in the weight room. But before one can do all those other things you listed at high intensity, one still needs to work on weights anyway, build up those tendons an ligaments as well as strength.
Your putting words into my mouth - I do sprint, I do bounds - I have posted vids of these, I do jump squats, I jump around a lot.
Latter on when I'm ready I will do depth jumps and so forth.
having said that let me quote John Smith on thrower Connie Price Smith
"In many cases Paul, speed and athletic ability becomes hidden because strength to body weight levels are to low. In college basketball Connie ran her butt off for 4 years and ran a 5.1 40 yard dash at 208lbs when she left basketball. Two years of weight training later she weighed 212 and ran a 4.7 and improved her vertical 6 inches without running or jumping in training"
All she did was rack pulls, squats, hang cleans/pulls, bench etc
I also feel triple jumpers are superior to high jumpers
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The strength requiremnets for triple jumping are enormous!
There are also quite a few olympic lifters who can vertical jump over 40 inches without doing much jumping at all, and these guys are fast in short distance sprints, some can out run elite 100m sprinters - in fact olympic lifting is pretty much weighted ground based plyos - things suchs as jerks, push presses etc all use and develop the stretch reflex in the hips . Not only that its because of all the heavy squatting and pulls they do, . there are no weak Olympic lifters

There is an Ironmind tape of a the world record holder in the snatch in the 85kg class doing standing jumps onto and off a 44inch high desk (he says his record is 56inches) - he does it so carefree and easily. And when you see the weights he throws around with apparent ease, you know why
Depth jumps do work, I am not disputing that - but there is a time and place for everything. If you weigh 250-300lbs, depth jumping would be the last place you would start at, hell even 200lbs feel a tad heavy sometimes
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