HOW TO LOSE FAT OR GAIN MUSCLE, If you are looking to lose fat, here are the key points and take away with you! Train Heavy: Even though we are wanting to burn more calories, it's not about high reps, etc... You still have to give the muscle a reason to stick around, hence the heavy resistance. If you are in the fitness and bodybuilding world for some time, you’ve probably seen there is a tonne of information about training but this will give you the correct advice you need!