These coasters will put your body to the test, battling gravity at every twist and turn. After a ride this extreme, you'll have to be peeled off of your seat. Featured Coasters: Medusa at Six Flags Discovery Kingdom in Vallejo, CA; SheiKra at Busch Gardens in Tampa Bay, FL; Apollo’s Chariot at Busch Gardens in Williamsburg, VA; Afterburn at Carowinds between North and South Carolina