Why is America less active today as compared to 40 years ago?
With changes in knowledge, physical labor is not wanted as if it was. In the past, people engaged in regular, moderate to vigorous, physical activity when it came to performing their jobs, household tasks, and even traveling. Today, equipments do the majority of the work that used to be complete by hand and buses and cars have replaced walking and cycling. While some stay active through recreational activities, a lot of spend much time in sedentary recreation such as watching television or using house computers.
