For myself, Genesis is (finally)doing a 12 week challenge starting mid June. My SIL has achieved amazing things in the Fernwood one, so I'm really ready to start this one. FH is volunteering all funds (which is pretty cool as we both still pay for everything bar the house/savings separately), and I really can't wait. I think given this challenge, and SIL doing the same thing, MIL will back down on feeding me all the time so I will be able to achieve something without her thinking me a cow.
It also means SIL and I can work to our own timetables, so that MIL doesn't tantrum about messing up her dinner times, haha.
It also starts when I finish uni and won't be working full time, so I will have plenty of time to hit the gym and prepare food.