Then, team sports have been a tradition for American kids, but COVID 19 worries and other factors have reduced the number of participants, impacting kidsâ health and fitness. Dan O'Neill, MD, EdD, author of âSurvival of the Fit: How Physical Education Ensures Academic Achievement and a Healthy Life,â talks about the potential health effects of inactivity and childhood obesity, and why physical fitness levels also have a significant impact on academic performance.