The top 10 activities that don''t count as warm-ups. Some of the following ideas may be incorporated into your warm-up, but none should be used as the sole activity when preparing for higher intensity exercise. What counts "The idea is simple. A muscle in a resting state has a certain length. Warming up improves the ability to move the muscle through its entire range of motion without injury. While warmth applied to the outside of the body warms the skin and parts of the muscles close to the skin''s surface, it doesn''t effectively warm the muscles, particularly the deep-seated muscles workoutcharts and tendons."

The original lyrics are deconstructed and reassembled at will by a rapper riding shotgun on the groove. Fitness is a good thing to have in your life. The instructor--a striking woman dressed in an oversized black T-shirt and baggy black sweatpants, with a shock of braids tied up overhead--glides effortlessly workoutcharts to the right in an intricate sequence of hip-hop dance steps. The 30-odd students workoutcharts behind her mimic each move to a T. “Turn it, turn it!” she yells, and everyone reverses field. “Grapevine! Do it!” Only by screaming into a handheld mike can she momentarily raise her voice above the music. “Grapevine, grapevine! One more, one more! Five, six, seven . . . Whe-e-e-e-e-e-e-w! All right!” After 10 minutes of this, the instructor stops the tape. By now her students are sweating rivers and sucking wind, but they workoutcharts appear to be having the time of their life.

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