HS/PE4 PPT?

I'm a bit confused about this exercise. I read some other threads and saw that the key is the hands and ribs pulling in opposite directions.

My question is about the lower back. Is it okay to use a posterior pelvic tilt to achieve this (only way I can)? When doing so, my glutes, hamstrings, and calves lift off the floor. I notice that the demonstrator's legs seem to stay on the ground, or at least his calves do. Am I doing this wrong, any suggestions?

Feet in the air or bent knees are both acceptable at the beginning.  Mastery requires everything on the floor with straight legs.

You want a posterior pelvic tilt on all of these progressions. With a strong enough pelvic tilt you should still be able to get everything on the floor even while fully contracting the glutes.

thecolin said:

You want a posterior pelvic tilt on all of these progressions. With a strong enough pelvic tilt you should still be able to get everything on the floor even while fully contracting the glutes.

For this I would like to add that you need hip and quad flexibility.