I don't remember what thread the whole "grind" discussion was in, but here is what Ortiz said a couple of days ago about retiring:
“Right now, my mind is made up,” he told Bob Nightengale. “Physically, I could do it, but mentally, I’m exhausted. Hopefully, everything keeps going well this year, because right now, everything is going perfect.
It sounds like the grind for him is more mental than it is physical.