It’s no secret that a solid weight-loss strategy calls for a balanced diet and regular exercise. But when it comes to the high-fat, low-carb ketogenic diet, your gym routine might change a bit. That’s because your body will be running on fat for fuel instead of energy-boosting carbs—and burning fat for fuel won’t give you the quick energy burst you need for tuck jumps and pushups like carbs will (but more on that later). While it’s not impossible to exercise on the keto diet, it will definitely be different.