Human physiology is designed for activity like walking, carrying, lifting, and occasional sprinting, but not typically for prolonged high-intensity endurance activities.

“you know we're designed for this through nature we designed to be very active creatures but you know most of the time if you look at tribes in the wild they're doing like 16 or 18 000 steps a day but most of that is out of sort of a comfortable walking pace lots of times they're carrying things or they might be they might be lifting chopping swimming you know whatever building and occasionally critical times in the hunt or whatever you know they might be sprinting although the younger members in the tribe would be assigned that task because they're faster runners but we're not really designed to do what you did when you were doing these like you still do you know do these really long bike rides the chambers or marathons ultra marathons”