Ms. Crowe receives regular home visits from occupational and physical therapists, who work with her on puzzles, problem-solving games and exercise, including walking, stretching, leg exercises and light weights.

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The researchers say anybody who uses a computer for prolonged periods should undertake frequent leg and foot exercises, and take regular breaks away from the screen.

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The two main exercises for quadriceps include leg extensions (usually done on an exercise machine) and squats.

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To warm up, she'll do balance-based exercises including a one-arm, one-leg plank to strengthen her core.

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