How Do You Build a Muscle?

I was thinking about this the other day while I was working out (Got a high school reunion coming up, dontcha know). The way you build muscle is to subject it to resistance. Of course, there are different ways of doing this. You can use weights, you can use resistance bands. If you don’t have either of those and don’t want to go to the gym, you can use your own body weight or things around the house. If you want to build muscles in your legs, you could go for walks, especially up hills. In that ...