Dalesean is on point here.
If you look into the biomechanics of bones, each bone is structurally different and adapted to different stresses.
For example, your arms and neck can't withstand the same business as your legs for long. Your skull isn't as strong as the femurs as it doesn't need to, etc.
The surface area for LS breaking isn't the same as a strike, meaning you'd need to look for harder, better feats for this.
If you want a general rating, Above Average factoring hysterical strength puts Newtons to max drive on the muscles and bones to where they fracture/tear. Average if it's bones technically anyone could snap (fingers, weak bones like that one in your shoulder)