Express Insanity

No matter if your goal is fat loss, muscle gain, or athletic performance, high-intensity interval training can help you nail it. … High-intensity interval training (HIIT) has become a popular way to burn fat in the gym, but that’s not all this type of cardio training is good for.No matter if your goal is fat loss, muscle gain, or athletic performance, high-intensity interval training can help you nail it. … High-intensity interval training (HIIT) has become a popular way to burn fat in the gym, but that’s not all this type of cardio training is good for.