You can train yourself and agility in different ways. One of them was a rat.

Any flat area

As long as the legs last

From 3 to a dozen participants

A long skipping rope, or two tied together, can also be a thick rope

Game rules:
One of the participants keeps the end of the skipping rope low above the ground and spins it rotating around its own axis. The other participants stand in a circle and jump over the rope. Whoever does not jump over, replaces the person from the inside and takes over the rope skipping.