Bicycle crunches work the abs and obliques. Lying on your back with your hands behind your head and knees bent, do this exercise. Get up. Straighten your right leg and bring your right elbow to your left knee. Switch sides, bringing your left elbow to your right knee and straightening your left leg. 20–30 times.
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Lower your right arm and left leg while pressing your lower back to the floor. Restart and switch arms and legs. Three to five sets of 10-12 reps per side. These three exercises develop core muscles and improve stability, balance, and posture.