Of course, those are just the mental repercussions. Now let's talk about how trying to be like the pretty Instagram people can physically hurt you. If you've ever watched real people at a gym, you know that exercise is weird and gross. People sweat and fart and make strange faces. No one wants to show that to the world on purpose. So if you're an Instagram influencer and want to show off your rocking bod, what do you do? Something that looks cool, even if it took you years of normal, ugly practicing to get there, or something that's so overwrought and bonkers that it doesn't actually do anything?
The most popular posts are the ones that involve unnecessary and difficult exercises -- ones that display strength, as opposed to building it. So if you try to emulate that, as many a #fitspo person encourages you to, that's a good way to pull something, or take a medicine ball to the face, or worse. Hell, sometimes you literally can't do something, no matter how much you practice, because the person doing it is basically a mutant.
Look, no one's saying not to exercise, or that pretty Instagram people have all made secret deals with various devils. I'm just saying to be smart, and maybe take advice from actual professionals instead of whoever has the nicest ass online.