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How Exercise Might Increase Your Self-Control - The New York Times

Most of the women gained a notable degree of self-control, based on their questionnaires, after completing the walking and jogging program. (In this experiment, they were told they were training for better fitness.) But the increases were proportional; the more sessions a woman attended or the more her average jogging pace increased, the greater the improvement in her delay-discounting score. These gains lingered a month after the training had ended, although most of the women had tapered off their exercise routines by then.

Yoga, meditation improve brain function and energy levels, study shows -- ScienceDaily

Thirty-one study participants completed 25 minutes of Hatha yoga, 25 minutes of mindfulness meditation, and 25 minutes of quiet reading (a control task) in randomized order. Following both the yoga and meditation activities, participants performed significantly better on executive function tasks compared to the reading task. "This finding suggests that there may be something special about meditation -- as opposed to the physical posing -- that carries a lot of the cognitive benefits of yoga," said Kimberley Luu, lead author on the paper. The study also found that mindfulness meditation and Hatha yoga were both effective for improving energy levels, but Hatha yoga had significantly more powerful effects than meditation alone.