Yoga was the only exercise I was doing (started end of April) until I started C25K (on week 6 now). I was doing a long routine (1-1.5 hours every morning), with lots of standing and strengthening poses. Now I do the C25K M-W-F morning followed by a shorter (~30m) of yoga, just stretching. I lost lots of weight and the yoga made me muscular! The flexibility increases are a given

and also quite lovely. I even had a little bit of aerobic conditioning going on, and I'm sure the yoga is what kept me from having the shin splints when I started walking/running that plagued me in the past.