I went abseiling with a group on Saturday, never done it before.
It was fun, but once I was over and started moving downwards I got this massive stabby muscle-type pain at the top of my hips (basically if you stand with hands at the front edge of bone, about where your jeans pocket is, that's where).
It lasted all the way down, and the residual pain was still there until another four or five people had descended. Later any particular core exertion made it twinge (initially even sneezing). Monday and Tuesday I was still getting effects.
I did find it quite difficult to stop the descent - I've known for some time that my core strength is terrible and I'm not strong enough to bear my own weight properly.
Nobody else seemed to have any trouble, though it's worth noting that I was the only postgravida.