It's true. The heavier a person is, the more stress they will place on their knees and joints. However, being overweight isn't a barrier to being a runner. Many of the 5K and 10K runs I've done have categories for runners called clydesdales. So, your weight is not a barrier to running.
But, you do need to be mindful of your knees and joints. If you've never run before I highly recommend starting with a couch to 5K program. This assumes no previous running experience and will literally take you from your couch to a 5K road race. You start with a series of walk/run combos as you build endurance.
Also, if you've never run, don't wear any old shoe. Go to a reputable running or sports store and get fitted for a proper pair of running shoes. Wearing the wrong shoes can cause even more problems with your knees and joints. Thus the need to wear good shoes. Try to avoid places like Walmart or Target. You really need to go to a running store if possible if not, a good sports store. The footwear stores that sell sports shoes like Air Jordan's aren't selling them for active people. Those are the shoes the kids wear for status. avoid those places too.
So, no you're not too big to run, but you will have to be mindful. check out a couch to 5K program. Spark People has one. www.sparkpeople.com/resource/fitness_artic
Edited by: ARCHIMEDESII at: 4/27/2013 (15:54)