until knees are flexed right-angled. Keep back straight, flex hips and move backward to keep knees above feet. Remain in lower position for a moment. Return, keep legs slightly flexed. Repeat.
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off floor moving chin toward chest. Simultaneously lift legs into vertical position. Keep knees straight. Keep position for a moment. Return, relax all muscles. Repeat.
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until knees are flexed right-angled. Keep back straight, bend hips and move backward to keep knees above feet. Return, keep legs slightly flexed. Repeat.
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with one leg. Simultaneously flex knee to lower body until knee active leg is above toetips. Extend knee to return to starting position. Repeat. Continue with opposite side.
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