1. NOT MIXING IT UP ENOUGH Committing to a workout program is a great first step—you start seeing results, gain more confidence, and have an easier time completing workouts. But one mistake that could cause you to plateau is repeating the same exercise routine over and over again. Your body adjusts and adapts to workouts, so it’s important to constantly alter your routine to keep your body guessing and your muscles growing. Try increasing tempo—you can have a fast-, medium-,