Okay, seriously people. One hundred percent means the whole thing. Everything. All of it. Nothing left.
If you are asking for someone to give 110 percent, you are asking something mathematically impossible.
(Well, maybe you could use it as a description of what happens when people juice up on drugs. “Use steroids! They’ll give you 110 percent of your normal human ability!” But that means if you are asking for 110 percent, you are asking your employees / students / fitness trainees to use drugs.)
A friend of mine told me that because I snark about this every time I hear it, I have successfully ruined an entire set of fitness videos for her. To which I say: You’re welcome. Sometimes we must sacrifice blithe entertainment for proper mathematics. It’s the right thing to do.