|Mine!! - source|
I am happy for something though. My definition of failure is new. I failed at making it through my cardio post workout. I expect 35 minutes of myself and delivered a paltry 10 ... but ... I made it through my warm up, I made it through my strength training, and I got on the treadmill, all the while knowing that I would hit an early peak from exhaustion. My old terrible workouts used to be the one rep squat to the couch and mattress assisted planking (which looks a lot like sitting on my butt, watching TV, then going to bed), but I have recently chosen to do something which I find very useful in maintaining my habits. I now define failure as occurring after the attempt.
Now, sometimes you need to tap out. The longer you work out, the more you learn the difference between good pain and bad, between tired, and wiped out, and when to listen to that little voice from your body that says "slow the heck down, or I will stop you". So I tapped out last night, to ensure my workout on Wednesday would be better. I failed at my goal, and I'm not too happy about it, but the work I did towards my goal still worked for me in the long term, and that's a definition of failure that I can live with.
Don't do too much people, you're not Superman. Unless you are, then awesome movie dude.