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.
Is Heel Strike Running Bad for Performance?
High impact running comes at an economical cost. By impact standards, heel strike running is a significantly more force-intensive style of running than forefoot running whereby according to some research, high impact demands more vigorous muscle tuning response to attenuate shock (a process that requires energy). Simply put, high impacts (like in heel strike running) drains energy from the system whereas stark decreases in impact (like in forefoot running) enhances running economy.
