In Two Player Mode, have one player press L1 + R1 + X + Left Analog Stick Forward, then have player two continually press Select.

Fat Players

In Two Player Mode, have one player press L1 + R1 + Square + Left Analog Stick Forward, then have player two continually press Select.

Gorilla Players

In Two Player Mode, have one player press L1 + R1 + Circle + Left Analog Stick Forward, then have player two continually press Select.

Thin Players

In Two Player Mode, have one player press L1 + R1 + Left Analog Stick Forward, then have player two continually press Select.