I think every time I've seen my nephews in the last...oh, two or three years? at least one of them (if old enough to talk) has repeated this phrase, sometimes repeating it a great many times (because it's just that kind of a phrase). They seem so taken with it.
I was originally going to title this post "Need more reps," and I was thinking about the body as machine, and that naturally brought me just now to the robot mantra. I was thinking of machines because I worked on some leg extensions at the gym tonight and tried to figure out the approximate difference between the amount of weight my right quadriceps (as my sister would say, my "withered leg") and my left quadriceps can move. Seems to be about 20 lbs difference. Or perhaps more, because I'm not supposed to be doing full extensions with the right (only for purposes of that exercise), and in fact it's kind of painful to extend too far with weight. Ten pounds with the right leg, in a shorter extension, let's say from 60 degrees to 135 degrees, felt about the same as 30 pounds with the left from 60 to 170. (I'm fishing for someone to impress me with his or her math and physics skills here.)
It was a good reality check, to see that even though stairs are feeling better and better, and I'm riding my bike, and I can jog 2-3 minutes at a time without any pain, there is still a big difference. I need more reps. I need to do a lot more of those exercises the physical therapist said to do. That's all I can say.