24 Hour Fitness in Altadena is a full-service workout facility. This lovely location (aka Altadena Magic Sport) offers state-of-the-art workout and cardio equipment, a beautiful lap pool and a trendy athletic wear shop. Their personal trainers and fitness consultants can help you get in shape, lose weight and build lean muscles with an All-Club Sport Membership. The Altadena location also has workout programs designed for kids and seniors.