Posted by: PFB
The vertical leg crunch exercise is one that is sometimes overlooked by a lot of bodybuilders, both professional and amateur. You should take a look at it because it is quite effective especially for your obliques and rectus abdominis. Here is what you will need to do:
1. Lie with the face up on the floor and start lifting the legs up while keeping your knees crossed.
2. Contract the abs muscles and lift your shoulder blades. The chest should try and reach the feet.
3. Keep the legs fixed and then after reaching the top position lower the legs but only after doing the crunches.
You should do around 2 to 4 sets, each with 10 to 20 repetitions. This should be enough and will work pretty well on your 6 pack abs. A demo video of vertical leg crunches can be seen after the jump.