Thank you for responding everyone.
Thanx for responding Chris. You are right- I didn't really see the difference until you pointed it out- the Butt Blaster starts with the thigh parallel to the ground so there is no hip flexion involved. I don'think this is what is causing the burn but it makes me realize that I guess the quads have to work (eccentrically) when lowering the weight... (? not sure)
Yes! Geez, that is so like me- skipping ahead etc! Phase 2 contains weighted bridges and the quadruped hip extensions. So I know I am not really ready for weighted bridges, so if I follow the program that means I am not ready for the hip extensions, you are correct. Also I haven't started doing hip thrusts. So maybe I should actually follow his program accurately!
Thank you very much Chris. Your advice is going to help me long term- I will follow this propram more carefully now- no more skipping ahead.