Q: What is something small I can do to improve my brain today? 

A: Give your brain enough oxygen. The brain requires 20 percent of all the oxygen your lungs take out of the air. When you breathe shallowly or walk and sit slumped over, the lungs may not expand completely and you may be slightly anoxic, or short of the amount of oxygen the brain requires for many of its chemical processes. Start the day with three brain breaths:  Breathe in through your nose to a count of 4, hold your breath for a count of 12, and breathe out through pursed lips to a count of 8. Take several more during the day, any time that you start feeling sluggish or sleepy.