Each week make it your goal to save as much as you can. I know in the beginning weeks it is so easy to save. So why not do it this way... if you were able to save the $40 this past week cross of week 40. If you were able to save $15 this week then cross of week 15. Why do this? If you follow the chart as-is, you are going to eventually run into a week where it's not easy to make that goal. If you fail one week, it could be pretty tough to get back on the routine. I am also going to work on putting away any $5 bills I receive this year and see what happens at the end of the year.
Good Luck and Happy Saving.