4. Side Plank
The side plank workout is one of the common and yet, best exercises for strengthening your core muscles and shaping your obliques.
How to do it: Lie on your side with your hips on the ground and your legs extended. Prop up on your right elbow. Rest your left hand on your left hip. Then, gently lift your body off the ground, leaving your elbow and lower foot touching the floor for your support. Be sure that your hips and knees are off the floor. Brace your abs and hold this position for 10 seconds. Repeat the plank, with gradually increasing the duration.