Gone are the days when all you needed was a leotard and leg warmers to get a great workout. From app-enabled shoes to water bottles that track your liquid intake and keep your water cold, technology rules the fitness industry. It’s hard to know which gadgets improve your workouts without becoming cumbersome to use. Fortunately, we have identified the five best high-tech workout devices that improve your exercise routine, help you build muscle and make exercise fun. Apple Watch/Fitbit Versa…