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.
More Reasons Heel Strike Running is So Bad
The impacts uniquely produced in heel strike running are so severe that they actually cause nerve damage, in addition to causing long bone, muscle and tendon injuries as compared with forefoot running, which provides a better mechanical base that produces significantly less forms of all impacts.