And zumba, watch your knees And zumba, watch your knees with all that, um, zumba. A friend of mine is marathon training and she's a zumba teacher (she doesn't BF though), and she's had some issues with her knees because of all the twisting and running. She's really careful and goes to the chiropractor when it hurts, but a couple times she's had to take a break from running for a few days. Just FYI! I think she runs 3 days, too. I personally had bad luck with doing more than 20. I did 23 in training and sort of fell apart, and then the marathon did not go well (um, also I was very newly pregnant, but still). I have built up to 20 in this round and I felt good, like I could possibly run another 6 and not fall over! Just my 2 cents. Rooting for you!