If you want to improve your pulling strength, core strength and increase your chin-up game it's imperative to understand the hollow position. The hollow body position can be done as a core exercise by itself. It can and should also be executed during your chin-ups. Point your toes forward, pull your ribcage down and slightly hinge your hips. You should immediately feel your abs contract as well as your lats. Try and maintain the hollow hold throughout your set.
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