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Your arms are important for balance as you run. Moving the arms in rhythm with your legs can also control your speed. Keeping your arms bent at a 90-degree angle keeps your biceps contracted, working them throughout your run. The forward and backward motion of the arms helps work your triceps and shoulder muscles.
Ad. Common pairs of antagonist and agonist muscles exist. In the upper body, the biceps and triceps work to complete actions related to movement of the arm. The quadriceps and hamstrings in the upper leg work to help move the knee joint and perform exercises, such as squats and leg extensions.