Yes I'm as surprised as you were.
From What Would Tyler Durden Do (highly recommended site, although not always safe for work, you've been warned!):
Snooki is roughly the size and shape (and color) of a basketball, so she should be good at rolling, but I was still genuinely shocked last night when she launched into a cartwheel-body splash onto Michelle McCool, getting the pin for her team to win their six way, inter-gender grudge match at Wrestlemania XXVII. Never in a million years would I have guessed she was athletic enough to pull that off. I couldn’t be any more amazed unless she proved she could read.
Source -> http://www.wwtdd.com/2011/04/snooki-was-genuinely-amazing-at-wrestlemania-27/