Hello, Thanks for writing to us Always warm up before exercising and cool down afterward. Stretch your quadriceps and hamstrings. Avoid running straight down hills -- walk down instead. Bicycle or swim instead of run. Reduce the amount of exercise you do. Run on a smooth, soft surface, such as a track, instead of on cement. Lose weight if you are overweight. If you have flat feet, try special shoe inserts and arch supports. Make sure your running shoes are made well, fit well, and have good cushioning. I do hope that you have found something helpful and I will be glad to answer any further query.