Extensions have been a huge part of my leg development. if you have worries about knee or joint problems, i would just go light and squeeze the hell out of every rep. theirs really no other way to isolate the quads.
ive always had great results with Kre-alkalyn. i Started using M5 a few months a go and have enjoyed the progress. i had a nice increase in strength. down side... its expensive. But if you have the money its worth it.
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