Meditation is another low cost approach to improving cognition. Meditation comes in many forms and even within these distinctions the same benefits can be shown like benefits in stress response Sudsuang, Chentanez, & Veluvan. Meditation can also improve cognitive domains like attention and reactions to stress. Intriguingly, Tang found cognitive improvements were seen after just days of training. The following link can help you find a meditation retreat near you https://www.retreatbase.com/ in the United States. You can also use this link https://www.retreatbase.com/ to learn more about mediation types and techniques. Free meditation apps like Headspace and Calm are availble. Also there are thousands of youtube videos to explore meditation and its cognitive benefits.