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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.
Because your lower back muscles help to comprise your core muscle group, and are recruited by all physical activity, these muscles can be strengthened and trained while running on a treadmill. According to Canyon Ranch, a leader in promoting healthy living, every exercise recruits and works your lower back muscles.