
There is a lot a person can do such jog or walk every morning, play basketball or any other sport with friends but if a person wants to have muscles and look lean, then one can sign up and workout in a gym.
People workout for 3 reasons;
The first is that the person is overweight and the only way to lose those extra pounds will be to reduce ones calorie intake and at the same time workout in the gym.
The second is that the person is underweight and the only way to add extra pounds is to have more calories in ones diet and workout.