What motivates

Roughly two weeks ago, I had an interesting interaction with my CF coach. During a particularly tough workout, I was behind. I had just toughed out my last exercise, and was spent. He announced 44 seconds to go. I knew that I wouldn't be able to finish the set, so I grabbed my water instead of making a vain attempt at trying to (usually poorly) try to finish a couple of the exercises. He tried the guilt routine. I don't respond well to the guilt routine.

Him -
"You are going to just quit with 40 seconds left?!?"

Me -
"Yep."

Him -
"Wow?!?"

Fast forward to Tuesday, another grueling workout (notice a pattern here?). One of the guys in the gym is a yeller. Screaming and roaring in the gym to "FINISH STRONG!" and "BANG IT OUT!" His screaming actually decreased my speed, because I was annoyed rather then inspired.

Early in my sales career, I realized that not everyone is motivated the same way. Unfortunately, not everyone has figured that out. So how do you broach that subject, especially with someone like a trainer? A quiet word of encouragement is much better for me then screaming. A calm "Come on, give us one more." will often yield more results with me then any attempt at provocation or embarrassment.

It is an interesting problem, and frankly one that I don't have an answer for. So what is the best way to motivate you?