When we drag ourselves out of bed for a workout, there’s one goal we all have in common: Get the most out of it. Unfortunately, research shows we’re not great at judging how hard we’re pushing ourselves during our sweat sessions. In fact, when left to our own devices, scientists discovered that we seriously underestimate just how hard we’re working. (Apparently that puddle of sweat you left behind isn’t always the best indicator!) So instead of continuing the guessing game, we went to the pros to get some surefire ways to determine if your workout is too easy. Follow their tricks so you’ll know when it’s time to step up your game.