Just 20 minutes of yoga significantly improves brain function Leave a Comment / Surveys / Opinions / Polls / By Varuna Khullar WASHINGTON: A new study has suggested that doing yoga for as little as 20 minutes may be able to boost your brain power.Researchers found that subjects who participated in a single yoga session had better speed and accuracy scores on working memory and inhibitory control tests than after they tried an aerobic exercise session of the same length.