Despite what has been suggested by doctors and surgeons for years, there appears to be no relationship between how much exercise or sports you do earlier in life and the development of knee arthritis. In a new study published in the journal Arthritis & Rheumatology, researchers at the University of Southampton in the UK analyzed six studies with data from over 5000 people who had no knee pain or arthritis, recording each person’s average time spent exercising each week over the next 5 to 12 years. The likelihood of developing knee arthritis did not correlate with physical activity levels or how much time people spent exercising each week. If you want to run, lift weights or do any other exercise or sports, don’t let a fear of developing arthritis stop you.