This group will consist mostly of people in the 15-35 age group, with the following characteristics:
They have muscles and bones that are strong, and joints that work well and are fully flexible.
They feel better after exercise and like out-of-doors activity.
Many are active sports people.
Mostly comprised of people in the 35-60 age group, with the following characteristics:
They have muscles that feel tired the day after exertion.
Exercise does not stimulate or improve their sense of well-being very much.
They enjoy good powers of concentration, but tend to put off doing things.