That can be three 10 minute sessions of vigorous walking, it doesn't have to be continuous and doesn't have to be strenuous. Vigorous will do. Brigham doesn't just preach the message, he lives it. And, without the required parking hangtag, a car is almost useless on a University campus. That forces him to use his bike for the 1.5-mile commute to work.
Stairs are right there, ready for use, free.
Brigham's concern is not only about the individual, but the community role in physical fitness. His new hometown of Columbia makes exercise available on walking trails, converted from banked railroad rights of way. But, there can be more. In small towns, finding a place to exercise can be a problem. But, there may be available resources not being used.