for me 3 things
1) dealing with the reality of how i am hurting my self medically vs the I am tough as nail and it won't happen to me thinking
2)Getting to a place where I can make me a priority
3) wanting to stay active and have fun....realizing how my weight is limiting me from activitries
4) wanting to play with grandkids 10 or 15 years from now
I am pretty much a solo exerciser, but I try to build that part into my day, especially by bike commuting. starting the day with a ride helps me motivate on eating well. Other people i know get support by going to group classes.....
A lot of people have had success with the group support of weight watchers
good journey
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Life is too short not to ride the best bike you have, as much as you can.