On our trail runs we do an out-and-back. Everyone sets their timers for 40 or 50 minutes or whatever we decided on. When time's up, we all turn around. Some of us have gone a lot further than others. But we all get back to start at the same time--except that the fast guys always shoot for a negative split so they pass me before I get back. Then they wait for me, or send someone to fetch me because I got lost (again)!