* Washing and waxing a car for 45 to 60 minutes

* Washing windows or floors for 45 to 60 minutes

* Playing volleyball for 45 minutes

* Playing touch football for 30 to 45 minutes

* Gardening for 30 to 45 minutes

* Wheeling oneself in a wheelchair for 30 to 40 minutes

* Walking 1.5 miles in 35 minutes

* Basketball (shooting baskets) for 30 minutes

* Bicycling 3 miles in 30 minutes

* Fast social dancing for 30 minutes

* Pushing a stroller 1.5 miles in 30 minutes

* Raking leaves for 30 minutes

* Walking 2 miles in 30 minutes

* Water aerobics for 30 minutes

* Swimming laps for 20 minutes

* Wheelchair basketball for 20 minutes

* Basketball (playing a game) for 15 to 20 minutes

* Bicycling 4 miles in 15 minutes

* Running 1.5 miles in 15 minutes

* Shoveling snow for 15 minutes

* Climbing stairs for 15 minutes