A very common error in the snatch is peoples lack of ability in pulling the barbell sufficiently and/or correctly back from the knees to the hip. Typically, two mistakes are evident:
1) They don't pull the barbell sufficiently back and therefore will have to shift your hip and your balance a bit forward in order to reach the barbell. The problem with this is that the forwarding shift in balance will most likely affect the balance and position of the catch-position negatively.
2) They do indeed pull the barbell sufficiently back but ALSO lean too much backwards with the upper body.
Solution: the goal should be to pull the barbell back to the hip, primarily by using your "lats" and not your arms, while finish the pull phase with your upper body in a somewhat vertical position.
This exercise is truly great at tackling the above errors. When you can do it decently correct from a technical perspective it is a great exercise for building strength and barbell capacity by adding weight.
Pointers: use straps; stay in a position where you can move your toes in the shoes; keep your arms straight; lats working at all time to keep the barbell close both on the way up and on the way down; don't focus on speed but rather movement and range of motion.
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