my dad almost pushed it too far as a paramedic firefighter.... .. and before that he definitely pushed it too far as a commercial salvage diver... ....it took a minor heart attack to make him stop. .... (that was when he invented that sockpuppet spoof the empty dive suit..).. ... but had that not happened he might have pushed on working as a paramedic until a major heart attack killed him.... .. he stopped doing volunteer stuff like working in the ships rigging at the same time he retired from diving too... ..he was living then by the old saying... there is always one more thing to do... i;m very glad he;s done with that... .