It can be tough to tell if you're exercising the "right" way.
If you don't work with a trainer, how are you supposed to know if, say, your form is spot on, or whether your workout routine matches your goals, or whether that exercise you do 100 reps of every day is really doing anything.
So, BuzzFeed Health reached out to fitness experts with all kinds of backgrounds and specialties to ask them for the most common mistakes people make with their exercise routines. Here's what they told us: