Throughout my life, I've alternated between running and cycling as my main sports. I tend to do one with a fair amount of intensity for about 5-10 years, then switch to the other for 5-10 years. Right now, I'm into cycling again, but it wasn't that long ago that I was doing some serious running. I agree that as long as I don't crash, cycling is easier on my body, particularly the knees and feet. However, I tend to be leaner and fitter as a runner than as a cyclist. It's relatively easy for a cyclist to carry some extra weight in the middle and still be a strong cyclist, but it's very hard for a pudgy runner to be fast. I enjoy both activities and do not think running for the sake of running is pointless or boring. I often ride my bike for the sake of riding and I don't find that pointless or boring either.