Leticia, a runner, wrote to ask how often she should practice yoga to see benefits. This is covered in detail in The Runner’s Guide to Yoga, which should be available almost any day now, but here’s my answer.
I’d say consistency across the week is more important than how long you practice each day. One longer practice each week, on a rest day or an easy day of running, in either a studio class or online/DVD, plus three or four shorter (10-20 minute) sessions after your runs should start to show you progress. It’s good to study with a live teacher to learn alignment, then make a point of being consistent in your practice at home. You should see some progress within a month or six weeks if you’re consistent about it.