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Hold for so long as you can and repeat by alternating legs. These are one of the hardest ones and you will struggle initially surely. But you will be astonished at the progress you make over the course of just a couple of weeks in power and flexibility! 4. Flat leg raises. Lying on your back together with your legs straight out in front of you, concurrently lift your hip and legs up off the ground and hold for 5-10 seconds. While returning down, attempt to under no circumstances let your feet hit the ground. You can also go side to side or have someone enable you to propel your legs right down to either side. 5. Maintain good position. Many folks are unaware of the benefits of good posture. More appropriately Perhaps, the undesireable effects of poor posture on your abs. Maintain your shoulder blades touching the relative back of your seat for best results.