Washing and waxing a car for 45-60 minutes.
Playing volleyball for 45-60 minutes.
Washing windows or floors for 45-60 minutes.
Playing touch football for 45 minutes.
Gardening for 30-45 minutes.
Walking for 35 minute (3 mph)
Wheeling self in wheelchair 30-40 minutes.
Basketball (shooting baskets) 30 minutes.
Pushing a stroller 1.5 miles in 30 minutes.
Bicycling 5 miles in 30 minutes.
Raking leaves for 30 minutes.
Dancing fast (social) for 30 minutes.
Walking 2 miles in 30 minutes.
Water aerobics for 30 minutes.
Shoveling snow for 15 minutes.
Swimming Laps for 20 minutes.
Stair-walking for 15 minutes.
Basketball (playing game) for 15-20 minutes.
Bicycling 4 miles in 15 minutes.
Skipping/Jumping rope for 15 minutes.
Running 1.5 miles in 15 min.

Remember it is a good idea to get a physician approval before starting any exercise program especially if you've been basically inactive for any length of time.