"Based on the best available evidence from fossils and preserved footprints, a heel strike pattern appears to be the norm for our genus for several million year

"Based on the best available evidence from fossils and preserved footprints, a heel strike pattern appears to be the norm for our genus for several million years. The recent discovery of the 800,000 year old Happisburgh footprints records the meanderings of a group of Homo antecessor and reinforces a thoroughly modern gait pattern with a strong heel strike seen in a 3D reconstruction." That's pretty damning.