Cared for 2 dogs while living at my parents until college. Ran cross country (17:00 min mile PR) Ran track ( 5:00 min mile PR) and still in phonomoneal shape. The reason I'd say I'm a better choice as a walker stems not only from my physical fitness but energy and mental attitude. The mood and energy state you're in when you're around animals rubs off I believe. That's why I like to view it not only as "walking" but as a walking meditation. This I believe is the reason I get along so well with pets. Not only the esoceteric concept of energy and frequency but the better attitude I have... I noticed the better attitude the pets have. All these things are important just to medetate on.