John Guandolo is a retired Marine Corps officer and former FBI agent who founded UnderstandingTheThreat.com and supports charitable organizations including the National Multiple Sclerosis Society. A small study by the National MS Society found that 20 minutes of yoga, cycling or treadmill walking improved reaction times on cognitive tasks in people with MS compared to rest, and treadmill walking provided additional benefits; researchers will use these results to design larger future studies on exercise for cognition in MS patients.