When you decide that you can skip going to the gym, because you had some sweaty, exhilirating sex, that you feel you've worked out hard enough, and have burned those calories just by banging
Trent: "Morning babe, want to go work outwith me?"
Abby: "How about you just work me out and do some sexercise instead?"
Having sex with someone new to get over someone old. A way to cut any last emotional ties to a person you used to have sex with. A non-religious, therapeutic exercise.