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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.
The greater your degree of hip extension, the more work is performed by your glutes and hamstrings--sprinting will build these muscles more than jogging. When you swing your leg forward to take another step you use your hip flexors at the front of your hip and your rectus femoris, one of the quadriceps muscles.