The physics part is correct but I believe the form is still a bit off - the tell is the landing on the tip of the foot, missing proper ankle dorsiflexion to land mid foot (the shin will cry ...), thus missing out the running efficiency from energy store/release of plantar facia. (I believe it's also not landing straight below. The little angle could still cause injury in the long run.) The "butt kick" should be under, not behind.