Start by lying on your back, on the ground, and pull your legs and upper torso up while doing your best to touch your toes with your fingers. The V-ups work your abs and your internal and external obliques.
Repeat this for 50 seconds and then take a 10-second break.
4. Leg raises
Leg raises are another great exercise for a stronger core. They work your abs and obliques. Start by lying down flat on the ground and raise your legs up to almost 90 degrees.
Do this for 50 seconds and then rest for 10.
5. Reverse plank with leg raises
The reverse plank with added leg raises will work your abs and obliques. Start in a reverse plank position and lift your legs in an alternating manner.
Do this for 50 seconds and rest for 10.