1) Burpees
Aside from strengthening your abs, this exercise also targets your chest, shoulders, lats, triceps, and quads. Burpees also stimulate your heart since they're plyometric.
2) Mountain Climbers
This moving plank exercise is similar to burpees in that it strengthens your core muscles in addition to a wide variety of other muscles throughout your body.
3. Turkish get-up
is a total-body workout that has been around for more than two centuries and requires the use of a kettlebell. Despite the fact that it is rather difficult to do, research has shown that the motion is quite beneficial for reducing abdominal fat.
4. Medicine ball burpees
Phelps recommends adding a medicine ball to your burpee to improve intensity and metabolism while growing six-pack abs.
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5) Sprawl
The sprawl is a burpee on steroids that burns calories and tones your upper and lower body, especially your abdomen. Touching your chest to the ground, then pushing-up to plank, elevates the burpee.
6. Side-to-side medicine ball slams
Explosive, metabolic, and dynamic medicine ball smashes. This workout uses obliques, hamstrings, quadriceps, biceps, and shoulders. This stomach blaster makes practically every other muscle a secondary mover when tiredness sets in.
7. Overhead medicine ball slams
Overhead medicine ball slams improve your core against gravity. Each time you lift the ball upward, your heart rate rises, testing your endurance. Use a hefty ball to maximize this workout.
8. Russian Twists
Russian twists strengthen and define obliques. With a medicine ball or plate, you rotate your torso from side to side while sitting up.
Incline Running
Running uphill increases calorie burn by 50%. Penfold recommends walking five to 10 minutes on a slope or an inclined treadmill. As you accelerate, your heart rate should rise quickly.