Chris Ponteri deserves credit, or curses, for inventing another new way to challenge endurance athletes. The organizer of the Icebreaker Indoor Marathon - 95.5 laps of running around the track inside the Pettit International Ice Center - teamed with the USA Speedskating to create the BladeRunner Challenge. Probably the only duathlon of its kind in the U.S., the race combines a 25-kilometer speedskating marathon with a half-marathon run.