"My running is good, but it's not what it should be, and I'm honest with myself enough to know that," said Martin. "The thing that I personally feel worried about is I'm an instinctive guy, an instinctive runner. Once I get out there, just like any other time I've been in pain, the pain is not going to matter. What I do instinctively, I'm equipped with the information to know that that's probably going to jeopardize my future as a human being."
Will Martin attempt another comeback next off-season?
"I don't know if it's even possible (to comeback)," said Martin. "It hasn't been possible up to this point."
So Martin continuing his career is a long-shot.
"I usually deal with things the way they are now, and it doesn't look like it's too bright as far as me having a further career," said Martin.
He feels that if he retires now, he won't have to have any more surgery on his problematic right knee.
"That was a large part of my decision," said Martin. "I knew that we could have waited until (next) Tuesday, but I feel as though we've given this enough time. I'm right on that borderline of having to get more done, but there's a possibility that if I stop right now that I may not have to go through those procedures."
And if he stops right now, he should be a first ballot Hall-of-Famer.