Bicycle Crunch
This is one of the best exercises to strengthen your abs and obliques muscle. Lie on the ground with your back pressed on the ground. Put your hands at the back of your head and raise your lower legs and ensure that your thighs are perpendicular to your hip and the lower legs are parallel to the floor.
Straighten your left leg and pull your right knee towards the right side of your chest. At the same time, turn your upper body, mainly the rib cage, to the left and try to touch your right knee with your left elbow. Return to the starting position and switch sides with hardly any gap in between.
Spiderman Pushup
Get into the top of the normal push up position. Ensure that your hands are shoulder-width apart while the legs hip-width apart and the body forms a straight line right from the top of your head to your heels. Tighten your core and slowly raise your left knee towards your left elbow and do a pushup. Come back to the normal position and switch sides.