1. Leg raise
Leg Raise. Straight leg raise engages the entire core and help activate the abs and hip flexors [3] by lifting the legs off the ground. This exercise is a little like the elevated leg lifts, only with one important difference — how high you lift your legs.
2. Side plank
Side plank. The side plank challenges your stability and improves core strength by working the muscles along the side of your body Side Plank Start by lying on your side. Now lift your hips up and place your weight on your forearm and feet.
3. Swiss ball climbers
For an exercise that lights up your entire core, it’s hard to beat a Swiss ball crunch. It really works the rectus and transverse abdominis
4. Leg circles
LEG CIRCLES. Lie with your feet straight up in the air, toes pointed and your arms out by your sides for support. This is your start position.
5. Dead bug
Dead Bug. How To: Trainer Tip: Only extend your arms and legs as far as you can without arching your lower back
Bird dog exercise
Bird Dog. Start on your hands and knees. Now together lift up your arm and opposite leg. The bird–dog is a bodyweight movement that strengthens the abdominal muscles, lower back, and glutes.
Scissor kicks
SCISSOR KICKS. Lie with your legs extended out with toes pointed. Contract your abs and lift your legs off the ground about 6 inches.Working out your core with planks, crunches, scissor kicks, and butterfly kicks can help build strength, making it easier to perform other activities