When boys exercise muscles in the gym, they can first find a coach to make a fitness plan. Prevent injury when using the machine in the next step. You can also do some strength exercises first. Do some push-ups When I was in college, I got a fitness card with my roommate because she wanted to exercise muscles. It started with me, voluntary movement. After a few days, we felt sore all over, and then found a fitness coach to make a fitness plan for us. We insist on finishing this plan every day. After practicing for more than a month, I feel that my muscles are more and more developed. So boys need to find a coach to make a fitness plan when practicing muscles in the gym.