Endurance. I don't know if my physical endurance has been improved because high endurance is the norm for me (I've previously done a lot of distance running).
He used to astound his friends with feats of physical endurance.
If a young man has trained his muscles and physical endurance by gymnastics and walking, he will later be fitted for every physical work.
Walking like swimming, bicycling and running, is an aerobic exercise, which builds the capacity for energy output and physical endurance by increasing the supply of oxygen to skin and muscles.
