Using the 100 day streak to get healthier and to put back 1.00 each day so when I reach day 100, I can reward myself with a new workout outfit or whatever I have decided on. Recently I needed a new bathing suit for my water aerobics.
It does not have to be as dramatic as 1.00 day for each day of exercise. find what works for you and them go for it. Perhaps you just want a magazine subscription to a fitness magazine and that will be only about .25 a day.