Is it better to run outside or inside?

If it is a race, the length of the inner ring is shorter than that of the outer ring, so it is more advantageous to choose the inner ring. If you just run for fitness, you can run both the inner ring and the outer ring, of course, it is best to run the outer ring. This is good for your health. However, when running, you still have to do what you can according to your physical strength.