JIM WVINNER / SCIENCE PHOTO LIBRARY JIM WVINNER / SCIENCE PHOTO LIBRARY
Yoga instructor helping a woman during a yoga class. She is helping her to attain the upward-facing dog position, or Urdhva Mukha Svanasana. This position is used to improve posture, strengthen the thighs, knees and ankles, and firm the buttocks and abdomen. Yoga is a system of exercises based around flexibility and relaxation.
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