I just recently moved to FL/PE5 on Monday. In the movement description it says that the arms may also be placed down by the hips. When attempting mastery I had my arms above my head like Dillon in the video. On my 4th set I began to fail around 40s and I moved my arms to my hips. It was much easier and allowed me to finish the set. I feel as though I could move through this PE if my arms were down at the hips the whole time.
I have continued to practice with the arms up form, but I am wondering why this is allowed if it makes it easier? Anyone else have this experience?