Lately, the morning after TWO, the area around my sacrum just aches, not pain, aches. I have assumed it's from tucking during the workout and that the insertions into the sacrum simply are not used to it. The more I tuck, the less achy it will be - I think. After a couple of hours of moving around in the morning, the ache is either gone or definitely less noticeable.
Does that sound right to you? Is it possible to OVER tuck?