It’s enough to make fitness experts despair. Despite all their efforts to get Americans to become more active, gym memberships actually fell 3 percent between 2006 and 2007. The good news: gyms around the country are offering deep discounts on memberships.

A funny thing happened after University of Michigan scientists ended an exercise study in which volunteers used devices called pedometers to count the number of steps they took. The research subjects kept on walking. The reason: they loved using their pedometers.

To be as fit as you can be, it may be better to take it easy now and then.

No more excuses. A new study shows that even 3-minute brisk walks can tally up important benefits.