Heel strike running is bad because multiple lines of research over the last few decades have proved the many verifiable aspects of heel strike running that are primarily responsible for nearly all running injuries vs forefoot running.

How Do You Treat Heel Strike Pain?
Heel strike running is the most damaging style of running to the heel because the mechanical risk factors engaged at heel strike were found to wear away the heel pad. What’s worse, cushioned running shoes was unhelpful because heel-impact was actually amplified. In recent years, several compelling studies have emerged to explain that the best path for protecting, not just the heel, but the body from impact-related damage, forefoot running’s claim to fame is there’s so little impact acting on the entire body that it does no harm.
