Yeah Ravn the early sets are generally ok but the 4th or 5th set is pure muscular failure.
However having said that, I have really studied the bent hollow hold form again and this morning got 5x36 pretty comfortably so it pays to keep a critical eye on your form!
This is by far the hardest movement for me and suggests my core strength needs a lot of work!!
347mont, stick with the SLS/im2 they do get easier!