Fortunately, regular physical activity and mindfulness-based practices are two of the most effective ways to reduce stress, lower cortisol, and protect your brain as it ages. Remember, your brain has a plasticity to it, which means that there is still time. You can change your behaviors and activity to promote a better gray-to-white-matter ratio and to move your body out of constant fight-or-flight readiness. Mindset and behavior are adaptable traits. When you have the right information to change your habits, you can improve your wellness on a daily basis.