[bluecalm]

Some studies suggest a lot of competitive high level runners heel strike. I am not sure if any elite runners do, I've checked quite a few and I am yet to see one.

I think it's about foot under your body not in front. You may land slightly in front but the moment there is weight on the foot it should be under your body. The other way of phrasing it is make your stride longer behind you, not in front of you. Apparently some people still heel strike just a bit when doing that but when you watch slow motion footage of them it's not immediately obvious which part of the foot hits the ground first.

For me personally heel striking is very unnatural. I needed to learn to run again after my knee surgery and anything but forefoot strike hurt a lot. Today it just feels very natural to me. I am not afraid of hurting my knees anymore, if anything Achilles tendon and muscles around ankles are things I sometimes worry about. Fortunately no serious injuries yet!