Build Fitness Without Demolishing Joints

High-impact exercises—such as burpees, jumping jacks and other moves that get both feet off the ground simultaneously—can help to build strength and endurance and shed fat quickly. As a result, they’re often incorporated into high-intensity interval training (HIIT) workouts, which have gained recognition because they burn an impressive number of calories in a short time and boost metabolism for up to 48 hours after the workout’s over, through the afterburn effect. But HIIT doesn’t necessarily need to include ballistic movement to be effective. Low-impact exercises can be used instead to…