"I definitely think it's something that I can learn from and hopefully change some things, whether it's how I work out or stretch or stuff like that," Crain said. "It happens. You play so many games and this is the first time it has happened to me. I'm lucky it hasn't happened more often.
"It's frustrating because I don't know exactly what caused it, and I want to be out there pitching. But it's a long season and it's more important to be out there longer than short term."
Crain threw on Saturday and actually got a little bit off the mound but wasn't totally letting it go. The good sign for the right-hander is that he pushed his effort a little harder and didn't aggravate the injury.
"You feel good pretty much with everything, you feel normal getting out of bed and coming to the park," Crain said. "Then, just once you get throwing and trying to get on top of the ball in the 'pen or on flat ground, it's kind of there. You kind of fight through it.
"There's a fine line between fighting through it and knowing if it's getting worse or whatever. I think it's definitely on the upswing. It's getting better."
The next goal for Crain is to throw a full bullpen session on Monday, and then move to a Minor League injury rehab assignment. But Crain will let his body dictate when that rehab trip begins.
"If I'm still feeling it throwing in the 'pen and I can't let it go all the way, I don't think I'm ready," Crain said. "But if I'm in the 'pen and I'm able to say this feels good ...
"Only I can tell that. It's my body, so as soon as that happens, I think I'll be ready. Hopefully it's Monday, but it's day by day."