i went to a shop that measures your feet and arch, video you running on a treadmill,etc and then they hellp you choose the right trainer. once you have one that fits good and is in your price/ fashion range, they stick you back on the machine and video you again and stack up the trainers of you need it. this makes sure that you don't hyperextend your knee...there was a term they used, pronate or something like that...anyhoo since i got my trainers from there i've really noticed the difference in my knee pains, they are soooo much better!
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