When you arrive at the gym, there’s probably a lot on your mind — from stress over neglected emails to excitement about weekend plans. While you certainly get bonus points just for showing up, if you’re working out while distracted or haven’t been trained on proper movements, your workout could lead to unintended consequences. Based on years of observations, I've identified the main moves people execute incorrectly time and again — and provided instruction on how to perform them properly. Thanks to my amazing friend and writer Jill Schildhouse for including my tips in this Oxygen.com article and to my beautiful clients Erica and Sarah for demoing good form.