At JW Tumbles, which opened in Herndon in April 2009, kids are treated to fitness classes, camps and birthday parties. JW Tumbles has classes for children aged 4 months to 9 years. A $50 family membership entitles members to discounts on classes and special events. There are also sibling, multi-class, and multi-program discounts. The hours vary depending on the classes offered; check their website for the most up-to-date schedule.