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ride and tie

vb. To take turns with another in labour and rest.

Wikipedia
Ride and Tie

Ride and Tie is a sport combining running, riding, endurance and strategy. Teams consist of two runners and one horse who complete a 20–100 mile trail course by "leapfrogging" one another. That is, one person starts on the horse, the other on foot. The horse travels faster than the runner; after a previously arranged time has passed, the person on the horse gets off, ties the horse to a tree and takes off running. The first runner comes up to the horse, unties it and trots or gallops down the trail. When the horsed partner reaches the runner, the person on the horse can either get off and exchange with the other partner (a "flying tie") or can ride on and tie the horse to a tree. Partners do this for the entire distance and each team learns to maximize the different members' strengths and weaknesses to their advantage.