Two to three times a week of cardio exercise can improve performance on the Stroop task.

“20 or 30 minutes of so-called steady state cardio you know figuring out how fast you can run or row or swim or stationary bike for 20 to 30 minutes at a steady state and then you analyze people's cognitive performance on a memory task can be a working memory task so remembering a short string of numbers or it could be math problems it could be the Stroop task any number of different tasks reveal the same thing which is that the longer duration lower intensity cardio also significantly improves performance”