1.There are so many variations of this exercise to make it easier or increase the difficulty level.
2. It works the WHOLE body
3. You can do it anywhere, not just at the gym.
The PLANK is an exercise that I call a 'classic' because you can do it with any workout and it never goes out of style like other exercises or fad diets.
If you have any questions just leave them in the comments below or email me at firstname.lastname@example.org