How does lifting something heavy build muscle?
In: Biology
To put it simply, when you exhaust your muscles by doing anaerobic exercise (i.e lifting heavy objects at the gym), you cause damage to the muscle tissue and cause tears.
If you provide the body with good quality protein and enough calories, the body repairs this damage and applies some more proteins to the structure for good measure, which makes the muscle bigger.
This process is called Hypertrophy.
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