I think you are right edw519. I tried to push myself beyond the pain threshold once and instead I got a fracture. I think the caveat is that you have to be in g

I think you are right edw519. I tried to push myself beyond the pain threshold once and instead I got a fracture. I think the caveat is that you have to be in good shape before you start pushing your pain threshold. For programmers/entrepreneurs, this may translate to pushing past your concentration/sleep/tenacity threshold.