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This is called the training economy. Getting stronger in the deadlift, reverse hyperextension and glute-ham raise will improve your power clean, but it doesn’t work the other way around. Basically, I choose the exercises that give my athletes the best "bang for their buck." Another benefit of my "economical" exercises is that they're much less stressful on the wrists, elbows and shoulders compared to the Olympic lifts.'
Powercleans really are not the be all and end all for explosiveness, not even close. A trap bar deadlift jump off a 4 inch box? box squatting with bands? that's how you get fucking explosive.
Like someone said try to lengthen your strides. I think one good exercise is like 10 squat jumps then around a 50 ms sprint. Your conditioning needs to be well enough to not excited, but a 5:45 is bad for sprinters. really work on explosiveness. That will be the key do NOT do to much distance that will shoot your sprints. Also lifting helps a lot and a really strong core. Watch videos on form thats almost as important as the actual sprint at high levels of competion. Strech a lot and stay hydrated, and stay loose during sprints
sparknote: explosiveness, and form are key