The study at the Max Planck Institute consisted of over 200 experiments for a ten-year period. ![]() Hettinger discovered maximum muscle growth can be attained by exerting 60% of existing muscle strength against a superior resistance for only 7 seconds once a day a remarkable fitness technique known as isometrics. ![]() Isometric exercises are science-backed techniques tested through international studies such as the below findings at the Max Planck Institute, one of Germany’s prestigious universities, and the University of Connecticut.ĭr.
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