6 Group HIIT Circuits That Burn Fat, Build Muscle And Improves Strength
High-intensity interval training is efficient—workouts are under half an hour and often just a few minutes. And they’re effective. HIIT improves athletic endurance, strengthens the heart and cuts body fat. Fortunately, the high intensity doesn’t have to mean high impact. Lower-impact exercises are great for people with knee or ankle injuries, or anyone heading back into the gym after a