eli5: why do we need to workout to be jacked, why cant our bodies make us naturally shredded

Question

eli5: why do we need to workout to be jacked, why cant our bodies make us naturally shredded

In: 90

Answer 1

Maintaining large amounts of muscle mass is a massive energy drain, requiring large amounts of calories.

In a society where food is often scarce, like we evolved in, maintaining lots of muscle is a disadvantage if it’s not needed.

So, your body will only build muscle if it thinks it’s needed.