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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.
For example going for a run on the treadmill for 20 minutes requires the following: 1  Nervous system â memory of running movement patterns, action potentials to skeletal, cardiac and smooth muscle. 2  Muscular system â contraction and force production of leg muscles to run. 3  Respiratory system â inhalation of O2 and exhalation of CO2.