First watch this video
Looks easy right....go ahead try it. I tried it and I can tell you I was shaking like I was being tasered after only 2 minutes. My shoulders were burning like crazy. It is incredible that something this simple can cause so much pain and discomfort....but I am hooked I need to be able to do this for 5 minutes myself
The following plank has a lot more variety, here is what is involved
- front elbow plank (FEP)
- FEP w/ right arm elevated
- FEP w/ left arm elevated
- FEP w/ right leg elevated
- FEP w/ left leg elevated
- right arm and left leg elevated
- left arm and right leg elevated
- right side plank
- left side plank
- right side plank with leg up
- left side plank with leg up
- top of pushup position (TOPP)
- TOPP w/ right arm up
- TOPP w/ left arm up
- TOPP w/ right leg up
- TOPP w/ left leg up
- TOPP w/ right arm and left leg up
- TOPP w/ left arm and right leg up
- right side plank, elbow locked
- left side plank, elbow locked
Get more details for the second plank here http://physicalliving.com/the-5-minute-plank-for-core-strength-stability-and-rock-hard-abs/