[quote=@Heartfelt Gamer]
Your ordinary Necromorphs don't really have any physical resistance, a simple punch can make them flimsy but they take hits and get back up. Think hitting a scrawny human and they keep getting back up without stopping
[/quote]

If I may interject here... The composition of the Necromorph is that of a living human. Its physical resistance would be equivalent to its host body. Punching it would only stun or slow their advance, but it would not break any of its bones. The only way where hitting a Necromorph wpuld break its bones if its host body had deceased for quite sometime where the bones are dry, hard and brittle.