cuz maybe his dog died or his wife left him and took the kids and his favorite pickup with her.
I think GS also could be thought of as minor injuries. Guys can be athletic and injury prone. They can be unathletic but never get injured (talking RL comparison)...the idea as other mention is that GS is more than just physically being tired or fresh. Its their overall mental and physical condition...its also HIGHLY random as I have discovered. They put in a factor of just guys being hot or cold...cuz maybe his dog died or his wife left him and took the kids and his favorite pickup with her.