[JesseK]

A buddy of mine who was an aeronautical engineer in college applied for one of those. "Physical Standards" means heart rate & blood pressure under stress. If it goes too high when you're down here, you could inadvertently threaten a mission in space, nor can it drop too low or "murmur" in varying pressure atmospheres (I lose at that point). If you have a healthy heart & lungs, (and don't show any impulsive destructive tendencies) most of the time they'll consider you.