The course is a 2.5-mile trail loop with a shorter 0.28-mile loop at the finish. Runners do as many laps as they can in 6, 12, or 24 hours.

Eagle Island State Park, near Boise; the start/finish

Above and below: the start

Finishing first lap

Finishing second lap

Finishing fourth lap

Finishing eighth lap (20 miles)

Finishing the 11th short lap

Finishing the 14th (and last) short lap

Above: the finish

Above: I've had better days

Above: with Jenny Stinson, marketing director for Marathon & Beyond and a Boise resident and ultrarunner

Starting another short lap