If you want to get a six-pack with your abs, you should definitely try this exercise.
It may be hard at first, but if you keep repeating it, you’ll get the satisfaction of burning abs.
00:00 Knee Touch Crunch
00:53 Reverse Crunch
01:38 Twisting Crunch
02:23 Elbow to Knee Sit up
03:08 Leg Raises Hip Lift with Head Up
03:54 Elbow To Knee
04:39 Alternate Leg Pull
source 5-MIN EXERCISE