These are plain old normal crunches which you do by lying on floor. These are an effective exercise for your abs. These crunches do not effect obliques. These are effective only on ab muscles. One of the best things about this exercise there is no need of any special equipment to perform this exercise except floor with carpet.
Form:

If you do not maintain proper form you will end up injuring yourself. In this exercise your lower back must be on floor all the time. You should not push your neck / you will injure your neck. The exercise starts by curling shoulders towards pelvis. Hands are use to just support he weight of the head so that neck flexors are relaxed. If you feel pain in neck you must stop doing this exercise.


Video Demos on how to do Abdominal cruches

Video Demo 2

Video Demo 3

There are variations of crunches.

• reverse crunch
• twisting crunch
• Thai crunch
• cable crunch
• bicycle crunch

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Tagged: abs workout, crunches