Many people run on hard surfaces like concrete several times a week. While this isn’t necessarily bad for your health, it can put stress on your legs.
Running is a high impact sport, and concrete is especially unyielding, which means that all the shock goes to your feet.
You might not be able to run as long as you want, and you might experience more pain afterward.
There are multiple shoes on the market designed to help people run on concrete. They absorb shock and provide enough cushioning to keep the feet comfortable.