Like many other people here, I think my mastery of SPL/PE1>iM (Swivel Hips) will be stopped by inadequate ROM (internal rotation of the hip); however, SPL/PE1 itself is not too difficult for me. (Not quite there by close.) Rather than just stalling for three months or six months or however long it will take me to get the ROM, I had a thought about progressing further:
1. Run the progression again, this time with backs of toes on the ground (like in PPP, the way Kira does it) rather than toes in a conventional push-up position, so that I'll be better prepared for PE2 once I have the ROM for iM.
2. Once I have 5x15r with PPP toe position, work up to 2-3 more sets of 15r. This will give me more practice at Swivel Hips after each set.
Would appreciate any thoughts.