Starting Strength, 3rd Edition - Mark Rippetoe [142]
Figure 6-56. The change in position from the hang to the rack is one of internal vs. external rotation. This change is what enables the vertical bar path through the top of the pull.
The next position is the jumping position, just like the clean again but with one important difference. In the clean, the bar leaves the thighs at this last point of contact somewhere in the mid-thigh, where the knees and hips have unlocked, the bar is touching the skin, and your elbows are straight; the jumping position is both the knees/hips-unlocked position and the point on the thigh where this occurs. In the snatch, the jumping position is just the knees/hips-unlocked position because the bar will slide up to touch the belly with straight elbows before it leaves the body. The jumping position for the snatch is the belly – the same as its hang position – not the thigh like the clean.
Unlock your knees and hips, just like you do for a vertical jump or standing broad jump. As you do this, slide the bar down the thighs, never letting it leave contact with the skin. It is common to bend mostly the knees here, which will leave the shoulders behind the bar. The involvement of both hips and knees in the jump is critical, since two joints extending explosively generate more power than just one. If both joints are unlocked, the shoulders will end up directly over the bar with it this far up the thighs. (The shoulders go forward of the bar, into the standard pulling position, when the bar gets lower.) The elbows are still straight and internally rotated, eyes are looking forward and slightly down, and feet are in the pulling stance.
From this position of contact on the thighs, slide the bar up to the belly and jump as high as possible. This should be a smooth motion that accelerates as the bar slides up. Before it leaves the body on the way up, the bar touches the same place on the belly that it did in the hang position. As you leave the ground, make sure your elbows are straight and that you’re jumping as high as you can, high enough that you have to fully extend the knees and hips to do it. A good jump will leave the toes pointed at the floor, not because you performed a calf-raise as a part of the explosion but because the explosive extension carried you up onto your toes. This knee and hip extension is what makes the bar touch your belly, so make sure the touch occurs. Don’t worry about the elbows the first few times – just jump high with straight elbows.
When your jump with straight elbows is working, jump and catch the bar in the rack position. Keep the bar close to your chest on the way up, and let the elbows bend after the jump to facilitate this. If you bend your elbows before the jump, you will dilute