 15 For the same distance, walking with a natural heel-first gait burns roughly 70\% less energy than running.
<meaning-changed>  15 For the same distance, walking with a natural heel-first gait burns roughly 70\% less energy than running.
 BioMotion Laboratory at York University in Toronto. For the same distance, walking with a natural heel-first gait burns roughly 70\% less energy than running.