Weights?

h3h8m3

You absolutely do NOT have to join a gym or lift weights. However, some resistance training is a very good idea.

I like to use body-weight exercises, because I don't want to invest the time or money to go to the gym.

There are all kinds of great body-weight training programs that will build muscle. Pushups, situps, pull-ups, arm haulers, leg raises, and so many others. There truly are a ton of ways to find success with getting a healthy body. Don't let anyone tell you that theirs is the only way.