Even if you just have a few minutes, you might move your body and raise your heart rate. . (You know those days when you only have 15 minutes between work, meetings, errands, and other obligations?
Crunches and planks may help develop your abdominal muscles, but they won’t alter your midsection. This HIIT (high-intensity interval training) exercise promises benefits by mixing core strengthening and cardio. To develop gorgeous lean muscle and get results quickly, the Tone It Up ladies recommend short, high-intensity exercise bursts. On alternating days, practice LISS (low-intensity steady-state) training.
While you may do just abdominal strengthening one day and cardio the next, combining the two may be more efficient. Cardio helps maintain a healthy weight by burning extra calories. 1st Remember to eat a balanced diet with a focus on healthy foods to maintain weight.

High Knees

It doesn’t have to be tough to have a good ab/cardio exercise. Begin with a basic round of high knees to raise your heart rate and strengthen your core.
1. Begin with a basic round of high knees to raise your heart rate and strengthen your core.
2. Keep your arms bent and palms facing down at a 90-degree angle.
3. Raise your left knee to your left hand, then rapidly switch sides, raising your right knee to your right palm as the opposing leg descends. This is one repetition.
4. Focus on connecting your knee to your hand while keeping your core engaged.
5. Perform 15 repetitions.

Bikini Walkout + Tummy Toners

The Tone It Up gals refer to them as Bikini Walkouts and Tummy Toners. This is a cross-training exercise that sculpts the obliques, shoulders, and legs.
1. Begin by standing at the back of your mat and extending your arms in front of you until you are in a plank position.
2. Bring your right knee up to your right elbow to return to the plank position.
3. Repeat the process on the opposite side.
4. Walk with your hands to your feet to return to a standing position.
5. Repeat on both sides 15 times.

Side Plank Crunch

The side plank crunch is up next. Anyone who has ever visited a Pilates class knows how beneficial this exercise is for shaping the obliques.
1. Begin in a side plank position on your right forearm, with your right (bottom) knee on the ground and your left (top) leg stretched out straight.
2. Straighten your left arm and extend it into the air.
3. Form a crunch by bringing your left elbow to your left knee. Back to the beginning
4. Engage your core to maintain a stable and balanced posture.
5, switch sides and repeat.
6. Repeat 15 times on each side.

Plank Jack

Move on to the plank jack, which is exactly what it sounds like: it’s a mix of a plank and a jumping jack. It sculpts the core and shoulders while increasing the heart rate for cardio burn you’ll love or despise.
1. Start with your shoulders over your wrists, feet together, and back straight in a plank posture.
2. Jump your feet out to the sides of the mat, then return to the middle.
Keep your body in a straight line while activating your core.
Do 15 repetitions of each exercise.

Bicycles

Without the traditional bicycle motion, what is an ab workout? This strategy has survived the test of time for a reason. It’s designed to increase your heart rate and tone your obliques.
1. Lie down on your back with your legs bent at a 90-degree angle.
2. Gently place your hands behind your head and lift your shoulder blades off the ground.
3. Straighten your left leg and twist to the right until your left elbow touches your right knee.
4, switch sides and repeat.
5. Repeat this on each side for 15 rounds.
Isn’t it clear that it’s not that bad? This cardio-ab exercise will raise your heart rate, aid in weight loss, and shape your abs. That seems like a great way to get some fast exercise. It also seems like the ideal exercise to perform while traveling since it’s fast, simple and doesn’t need any extra equipment. You just need your favorite exercise leggings and sports bra, as well as a yoga mat if you have one. Goodbye, aerobics in a hotel room!

Your abdominal muscles will become stronger as a result of regular exercise.
But if your abdominal muscles are covered by a thick layer of fat and cannot be seen when you twist, crunch, and bend to the side, you should not undertake these exercises.
Subcutaneous (under the skin) fat can obscure the view of your abdominal muscles if it is present in substantial quantities.
The removal of subcutaneous fat from the abdominal area is necessary in order to achieve defined abs or a six-pack.

Reference
healthline.com
fitness.com