That's why running is a high-impact activity. And for some people, the Walk turns into hot sex motivation is a dog — studies show that owning pets is good for health, and walking the dog is a major reason for this benefit. Fit and comfort are more important than style; your shoes should feel supportive but not snug or constricting. Running is the poster boy for aerobic exercise. To stay well, walk for 30 to 45 minutes nearly every day.