Hello,
First of all, let me say that it's lovely you've decided to join a fitness institution. It is rare to see girls of your age decide to exercise, especially when it's much less work to just not eat things. There are, however, a few things I've been meaning to tell you:
1. Here at the Grown-Up-Gym-For-Adults, we take our workouts fairly seriously. Oh, we have fun and we chat while stretching and whatnot. But while we're here, we get down to business. I guess your life is just so funny all the time that you can't help but giggle at everything you do. Awesome. I hear laughter is great for the abs. Now, go do three sets of shut the hell up.
2. Your Juicy booty shorts are adorable, especially the way you have them rolled down to your pubes. That bra-top thing that isn't really a bra or a top is cool; I like how you've pushed it up to your chin. I'm sure your parents were thrilled with the naval piercing. Did you guys get matching butterfly tattoos? Because that is so cute and I can totally tell you are bff. Not to mar your expression of individuality here or anything, but do please try to put on clothes and then actually wear the clothes you've put on. Everybody's doing it.
3. The walls of mirrors are here to help you correct your form during the work out part of your workout (which I assume you will get to once you're done the social part of your workout?) But hey, I guess they work well for helping you reapply lip gloss, too. Omigod, you missed a spot. Right there. Ok, got it.
4. I'd love to know what this new exercise you're doing is called. You know, the one where you stand side-by-side holding barbells, and then pump the weights into the air while jumping up and down? Oh, girls. Such a transparent effort to have all eyes on your bouncing tits. Maybe you'll learn the subtle arts of seduction later in life. For now, let me save you the trouble of straining your mammary tissue and let you in on the obvious: all the male eyes on you here are gay.
And remember, beauty is only skin deep but stupidity goes all the way down. Best of luck meeting your fitness goals.