So far on my practise run it seems a bit easy compared to other challenges I've tried. Might you consider an extra dimension, maybe additional challenge of making new friends, learning a new skill or something?
It's not even too hard to get the fat, lazy sim to workout once they have the fitness skill they seem happy to jump on the treadmill at every opportunity.
Also, with the GT pack people keep texting to ask my Sim to go party ;is this ok as long as it's not a "club"activity?
Thanks
Tracey