Thanks Fred,
I'm surprised at how fast I've made progress on the hollow and arch holds - It seems like most of the progress came from just realizing that I was giving up because I was uncomfortable from burning muscles, not because I physically couldn't continue. Once I pushed through to 60 seconds the first time I realized I could probably do it most times. Sometimes with the hollow hold though I feel my lower back lift off though and I call it quits at that point. I'm really looking forward to testing my new max times at the end of my SCC!