Running is NOT bad for your knees if you land with a forefoot strike, but if you land with a heel strike, you will eventually struggle with knee injury due to the excessively high compressive forces that naturally accompanies landing heel-first when running. Here’s more on how foot strike pattern as well as certain kinds of running shoes can make or break your knees:
How Can I Run Without Injuring My Knees?
What can a runner do to protect their knees? Research shows that heel striking and wearing a knee brace are the two biggest contributors to chronic knee pain and injury! As it turns out, heel strike running or running with a knee brace pushes many aspects of your stride mechanics out of neutral range, resulting in excessive impact on the shin and knee! This is why a knee brace is an imperfect solution because it comes with a heavy burden, whereas forefoot running is seen as a net positive, promoting reliable impact protection and more controlled stride mechanics necessary to preventing knee injury.