Pennock Hospital in Hastings has one of the best fitness gyms in west Michigan. Monthly membership may be paid for by your HMO, such as Humana. Info here.
Irish dancing is probably the most intensive dance exercise in the area. Irish dancers meet every Thursday at the 6th St Hall in Grand Rapids. Donation is $2.50. Beginners are welcome. All dances are taught/called/guided. A map is here.
The 24-Hour Challenge is an event to see how far you can bike in 24 hours. Top riders do over 200 miles. Beginners sometimes do only 30. It draws 1500 riders from all over the US. Info is here.
Governor’s Council on Physical Fitness, Health and Sports events, 2008 http://www.michiganfitness.org/endorsements/
If you must exercise, might as well do while holding a nice lady or gent. Contra dance and other events calendar.
Triathlons
Tri del Sol triathlon at Camp Manitou-Lin July 19 http://www.greatlakestri.com/
United States triathlon race event schedule http://www.trifind.net/