They aren’t both made of concrete, streets are (generally) paved with asphalt, and asphalt is SLIGHTLY softer/squishier.
So there’s the theory that it’s better than running on actual concrete.
But in reality I think it would have more to do with the fact that streets are often much smoother/more even than sidewalks. Where side walks have tree roots, curbs, driveways. Etc etc.
Most running injuries aren’t from the surface being hard, they’re from poor form/overuse. Putting too much stress on the joint.
And the uneven and choppy pace you might have to take when avoiding bumps and cracks and roots and curbs on the sidewalk could be what causes you to take a misstep or over extend and cause an injury.
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