I am a creature of habit. I eat at the same restaurants, watch the same programs, drive the same route, and the first thing I do every morning when I get out of bed is brush my teeth. NO EXCEPTIONS. 

The creature of habit thing serves me well in exercise, at least with marathon training. I've used the exact same program, no deviations, to train for my last 3 marathons, and I've PR'd in each of them. Lately, however, I've felt the need to mix up my routine. 

Why? For one thing, I'm bored. My routine for over two years now has been run 3 days, bike 2 days, weight train 2 days. If I get a wild hair, I throw in a day of yoga. More than that, the days I do each of these exercises has been set in stone. Run T-TH-Sat, bike MW, weight train MW. Can you say "rigid," boys and girls?

So, thanks to marathon training being over (until July) and the magic of groupons, I'm branching out.