What % is really enough?

Are you giving it your all? If you were, what percentage of effort would you say you are giving? Would it be 100%? 110%? 150%? Maybe even 1000%? I want to know who the first guy was that 100% just wasn't good enough for. Who was the first guy to "give it 110%"? Is this lift of 10% over what is theoretically possible due to some sort of performance enhancers? Just when you thought you were giving it everything you had, now you find out there are additional levels you can go to beyond the limits of mathematics. Amazing.

This really drives me crazy. We were watching American Gladiators (high comedy, by the way) last night, and two different contestants talked about giving it greater than 100%. The first said he was going to "give it 150%". By the time the second contestant a woman pledged to give it "110%" we knew she was slacking off. Maybe there are gender differences though? Maybe women can't achieve that extra 40%? I don't know. I'm just confused. If you have an explanation and you could provide it, I'd be 100% thankful. I might even be more thankful, but I'm not sure. That's where you with the explanation come in.