Personally, I am the type to avoid pain at all costs.
I also actively seek pleasure, so for me positive reinforcement works best. Creating negative emotions, just to come out on the other end happy again, seems like pointless, unecessary torture.

So my goal is to make life even more pleasant by trying to teach myself to actually ENJOY doing things I normally hate or avoid doing. The issues with me are not emotional, I'm just plain lazy. I'd rather do something fun than something productive, but unpleasant. If my subconscious mind could believe that paying bills, cleaning up, working out, etc... was actually ENJOYABLE, then I could be more efficient AND happy!