First, physical fitness (specifically, muscle mass and strength levels) is one of the strongest predictors of future health. And resistance training is the most practical and proven way to build muscle mass and strength. Having more muscle improves metabolic health markers such as insulin sensitivity, reduces all-cause mortality risk, and may reduce the risk of cardiovascular disease, heart attacks, and strokes.3 Second, heavy loads are required to create adaptive responses (healing responses) from connective tissue like tendons. Easy exercise and light training won’t cut it.
