This plank challenge workout could be the key to toned arms and flat abs. It takes about 20 minutes (there are modifications for beginners) and will leave your arms feeling like jelly — in the best way possible.
Who needs equipment for a great workout? This no equipment arm workout will tone and strengthen those arms in no time! - Tap the pin if you love super heroes too! Cause guess what? you will LOVE these super hero fitness shirts!