HIIT - High Intensity Interval Training. The very best thing you can do for your heart and to burn off body fat. I do this, too, on my street. I walk from my house down to the bottom of the cul de sac, downhill. About maybe 100 - 110 yds. Then I run up to my driveway, and turn around, and walk back. It is a killer. But, it burns off body fat just about better than any exercise (that, and lifting weights to build muscle mass for post-menopausal women, who lose muscle mass at a much faster rate than pre-menopausal women). You should be able to run, Alan. Let the minsical tears heal, and allow the bursitis to resolve with rest and ibuprofen. There were some very good studies published just recently that showed running in later years actually doesn't do the kind of joint damage we had originally assigned to running. Buy the very best running shoes money can buy, designed for running on either hard surfaces, if you're running on the street, or for uneven surfaces, if trail running. You cannot spend too much money on your shoes. I don't think I could ever claim being in as good a shape as you, Alan, but good for you to give that kid a true run for his money. Bam.