By US News on 05/22/2018
“… The research, conducted by the European Association for the Study of Obesity in Malaga, Spain, tested the aerobic fitness of 11-year-old boys by measuring heart rate recovery, the speed at which the heart rate returns to normal after exercise. The use of the metric as a gauge for physical fitness and the risk of cardiovascular diseases was based on a recent study that showed children with higher body mass index, or BMI, had slower heart rate recovery, suggesting a potential connection between healthier body weight and faster heart rate recovery …”
Read the entire article: https://www.usnews.com/news/health-care-news/articles/2018-05-22/study-boys-fitness-has-declined-over-the-past-20-years