Sprints burn fat best. An air bike works the arms and legs while reducing joint impact.
This crunch approach tightens the core. A bike crunch works the obliques and twists the shoulders with each exercise.
Kettlebell swings raise your heart rate. The hips and legs generate force while the upper body stabilizes and supports the weight.
Burpees may be the best bodyweight calorie-burner. Moving your arms and legs forcefully will raise your heart rate immediately.
This high-intensity exercise involves throwing a medicine ball as hard as possible. Use a 15- to 20-pound, non-bouncy medicine ball.
Squat leaps are a great plyometric exercise for increasing heart rate and burning calories.
The dumbbell thruster, a complex exercise that stimulates numerous muscular groups, burns calories well. Thrusters tire most people quickly.