Home Save Flex Fitness171 S Middleton St Robbins, NC 27325DetailsOpen in Google Maps Directions Share Flex Fitness Go To Website Overview Map View 171 S Middleton St Robbins, 27325 (910) 948-2544 Flex Fitness will do anything we can to help boost your strength, self-esteem, and confidence! The gym also offers karate, yoga, and physical conditioning classes offered by individual professional trainers.