PROPER AND IMPROPER FORM FOR COMMON EXERCISES A man demonstrates sit-ups with straight legs and sit-ups with bent legs. He demonstrates touching his toes with a bouncing motion and with a stationary position. He demonstrates squats that go all the way down - straining his knees, and squats that go half way down - protecting his knees.
Date: March 24, 1989 - COLOR Source: Video: DV Length: 00:00:28:00, No Audio
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