Yesterday while I was coaching, one of my favorite athletes asked me what I tell myself in the middle of a workout. This is a good question since I've been telling myself a lot of stuff lately just to keep going. I posted this over two years ago (wow!), which details my thought process during a workout. My mindset hasn't changed much. I don't listen to an ipod when I run; I generally let myself think and feel and be in the moment. But this is a sampling of what I tell myself when I need to keep going.
"You've done this before. You'll do this again."
"That ball won't pick itself up."
"I never walk during a run. I'm not going to start now."
"Of course I want to stop. I always want to stop. But I can't. I'll keep going until I can't go anymore."
"I am SO HUNGRY." (this is usually during a metcon after we've lifted heavy stuff)
"Should I take my shirt off? It's hot. I don't want it to look like I'm taking my shirt off for the sake of taking it off, but it really is hot."
"Pick up the bar."
"Pick up the ball."
"Shit. I'm not going to set a PR. But I can't quit. I'll keep working until I can't."
"I don't care if my hand just tore. I have to finish these pull-ups."
"I can do this."
"If that person can do this, I can do it." (I try not to resort to this.)
"I can't get a PR if I stop."
"I can't get a DNF by my name."
"This feeling will go away."
"I hate running. But I'm here and I have to."
Feel free to add anything that works for you. I know I have a tendency to drown out other people and/or music and focus on my own thoughts (unless the song is really bad, then that's all I can think of). Basically, don't quit. I'm not a quitter.