2: Contracting and relaxing of biceps and triceps during flexion (a)
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2: Contracting and relaxing of biceps and triceps during flexion (a)
2: Contracting and relaxing of biceps and triceps during flexion (a)
2: Contracting and relaxing of biceps and triceps during flexion (a)
2: Contracting and relaxing of biceps and triceps during flexion (a)
2: Contracting and relaxing of biceps and triceps during flexion (a)
2: Contracting and relaxing of biceps and triceps during flexion (a)