Check out the transcript of a message board discussion with Weather Expert, Ingrid Amberger. Dr. Jeffrey Masters, Director of Meteorology for the Weather Underground Web site, answered student weather and winter storm questions in the winter of 2001. Dr. Masters received his B.S. and M.S. degrees in Meteorology from the University of Michigan.
It is easier on the joints than running. It is non-impact and therefore safer and easier on the joints. Biking is an exercise that you can do even at an older age. It is a great aerobic exercise for losing weight and increasing cardio endurance.
Here are some examples of aerobic exercise: Take a brisk walk (outside or inside on a treadmill) Go dancing; Take a low-impact aerobics class; Swim or do water aerobic exercises; Try ice-skating or roller-skating; Play tennis; Ride your bicycle outside; Ride your stationary bicycle indoors