The first thing I read was of my character on the phone talking to Sydney's fiance. Though short, it was so beautifully written, and it made me laugh. I thought if I wanted to play a character, this would be it.
It's a question of spreading the available energy, aerobic and anaerobic, evenly over four minutes. If you run one part too fast, you pay a price. If you run another part more slowly your overall time is slower.

