It was several things for me.
Father passed from a heart attack almost 2 years ago now and I gained about 40lbs.
Scale hit 350 one morning and something about that number scared me and I realized I wanted to see my 15yr old graduate HS.
At Christmas last year DW asked what I wanted for my 50th birthday in January.
We both started IP the day after the big 50th party. Best gift ever