great article!
but to avoid injury please keep your back straith. you can only do this if you turn your shoulders enough, and bend at your hitting arms waist. if your other sides shoulder falls to much backwards, you will get injured! watch how strait the back of boris, federer, mc enroe(for us oldis) are. they bend sideways, not in to there back!
mahalo
jan
but to avoid injury please keep your back straith. you can only do this if you turn your shoulders enough, and bend at your hitting arms waist. if your other sides shoulder falls to much backwards, you will get injured! watch how strait the back of boris, federer, mc enroe(for us oldis) are. they bend sideways, not in to there back!
mahalo
jan
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