Squats exercise your butt and hamstrings, but primarily strengthen your quad muscles. Doing squats requires no equipment, but adding a barbell intensifies the workout. This video shows both techniques, and more.
dummies
Source:http://www.dummies.com/how-to/content/how-to-do-squats.html
My hamstrings were used to be very weak. I started doing squats for one months only to find drastic change in my health. I am much stringer that before.
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Evan
Organic Noni Juice