ok. but guys.... that girl is not doing a proper form!
REALIZE that the plank should be pain free in lower back.
her plank will make your lower back hurt as hell and that will not be plank at all but a lower back exercise,
REMEMBER you need to tuck in your butt(no matter how big your booty is you got to make it FLAT. ) make the lower back straight. only then you will be able to achieve long lasting results. and proper form without any future degradation of your SPINE.
it will take you months to cure yourself from lower spine wrong tilts.
it is an ab exercise not lower spine exercise, it is targeting the whole core.
if you are feeling PAIN in LOWER BACK STOP the exercise . look at how you are doing it. strive for proper painless form.

PLEASE realize that there are many instructors out there who dont know anything about body mechanics. use your own brain to know which is better and healthier to do. and pass on the knowledge.

PEOPLE HATE PLANKS COS THEY DONT KNOW HOW TO DO THEM WITHOUT THE PAIN.

WRONG PLANKS


PLANKS DONE RIGHT

HAPPY PLANKING