Forum Thread: A Great Exercise for the Whole Body, Core Muscles, Legs and Shoulders Work Here at the Same Time.

Its my version of Mountain Climber with medball. This is a great full body workout for runners. Try to do 6 sets of 20 seconds. A great exercise for the whole body, core muscles, legs and shoulders work here at the same time. I love when different groups of muscles work in one exercise??, so you can train more effectively??.