A good 2-part article from REI on mindfulness and running that also can be extended to cycling:
I do 10 minutes of daily meditation using the Headspace app and really like it. I do the basic 10-day free series over and over. I think it really does help with getting through tough workouts and rides not to mention plain old daily stress.
Anyone else meditate? Any favorite apps? Or maybe just some good tips to consider for making the most of meditating?