Becoming a personal trainer takes some effort, but it can be a very rewarding career.
There is a lot of turn-over in our industry and it can be competitive. Here are some things about personal training that you might want to consider.
1) It’s not just about the hour you spend training the client. You will (or you should) spend time outside of that session planning for that client.
2) It’s not just about your ability to teach others what you know about your body. You need to learn about all sorts of types of bodies, health conditions, modifications, etc. As a fitness enthusiast, you’re already an expert on your own body, which is a good start. But you need a personal trainer certification that will teach you how to work with the public.
3) You need to have selling skills, unless you work for a club that gives you clients.
4) Education is important. But so is experience. You might want to do some informational interviews with trainers in your area to see what their day / week / job is like. You might also shadow them training for a few hours if they allow.