So,I'm currently planning what to do after high school... I want to do something totally new and exciting with my life. I am also trying to get fit. I thought about it, and I think becoming a personal trainer at a gym or something would be fun. I'm ready to commit to it, and I'll to any schooling or training I have to. So I've been researching and noticed you have to have certification.
My question is, what's the best certification program out there?

For someone who wants to do training at a local gym or what not, nothing major (I have other plans in life too) And other details would be nice too, like cost & time required or anything else thanks