Two participants stand on one leg on the narrow side of a long bench and face each other head-on (stand on a wall, ground line or other elevation ►outdoor version), pressing the inside of the foot of the free leg (also possible with the outside edge of the foot) against the foot of the other person, then trying to push their partner off the bench without losing their balance. Switch legs from time to time.
Material
1 long bench
Indoor post setup: Narrow side of the long bench points upwards.
Outdoor: Narrow wall, ground line or other elevation.