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.
“And by the way I don't object if people want to attack me, that's their right. All I'm suggesting that it's not going to be very effective and that people are going to get sick of it very fast. And the guys who attacked each other in the debates up to now, every single one of them have lost ground b”