If you are looking to improve your abs, I definitely suggest jumping into this challenge!
Another challenge I have been doing, is the TransAmerican Run. I started this challenge *last* January, and it took me all year to get through Virginia. But wait, let me explain better! The TransAmerican Run is a virtual run across the country. After every run, walk, or bike ride you enter your mileage on your calendar, and it tells you where you are. You start in Virginia, which is a very wiiiiiiiide State, and it took me all year to get to Kentucky. What a party I had when I finally got there! And stayed there, lol. I will have another party when I finally get out of Kentucky, lol. It is fun to see how far you get each month, and I always look forward to entering my runs!