How did I do it? With a FUBAR Exerto 5000 Multipress Exercise Machine! My college sim went outside to exercise, and I kept getting these notices that she's gone up in skill wondering "what in the heck?".
Although I appreciate the thought EA, I didn't want body skilling to be that easy! Thankfully I was able to fix it (for now) by deleting the object and buying a new one. But I did take a screenshot for laughs.