Outside of a marathon, the best way to test people's endurance is to see how long they can listen to a radio play-by-play of a marathon. Take on a real challenge with this Groupon.
$15 for a Tour de Grove 5K Race Entry ($30 Value)
The Tour de Grove 5K will be held at the NCC Tour de Grove race course on Saturday, May 12, starting at 9 a.m. All 5K participants receive a race-day T-shirt.
Big Shark Bicycle Company
The cycling enthusiasts at Big Shark Bicycle Company cultivate a collection of bike-related products, events, and classes to cater to cyclists of all levels. They host a variety of races and events including 15K races and group rides every Saturday. And, to help bikers train for such events, Big Shark Bicycle Company also offers classes covering topics such as cycling 101, how to dress for winter biking, and basic training for racing.