Why do muscles need to lift weight to grow?

Question

As opposed to the human body controlling muscle growth from within?

In: 76

Answer 1

When you lift weights, you are basically using more energy than you usually do in a normal day. This process damages the muscles microscopically which then creates small spaces with the muscles. When you rest and sleep, the muscles fix themselves with more muscles tissue through the food and proteins which itself helps in growing the muscles.