Reverse Crunch (targets the rectus abdominis and obliques)
"The rev crunch or the reverse crunch warms up your core while also giving your lower abs a burn. Lie on your back with your hands down on the floor and draw your knees up to your chin slowly."
Repeat the exercise 15 times for a total of three sets.
Double Knee Crunch (targets your upper and lower abs)
"Lay flat on your back with your hands placed gently behind your head and your knees bent, feet flat on the ground. Curl up by lifting your head and shoulders off the floor while also curling your knees towards your chest. Return to the start by slowly uncurling."
Repeat 15 times to complete one set. Repeat for three sets.