Polar has a way to compete against ever more fitness-savvy smartwatches: offer exercise tracking that's difficult to match. It's launching two fitness watches, the Vantage V (above) and Vantage M (below), that promise more insights for particularly committed athletes. Both include a Training Load Pro system that melds cardiovascular, muscular and perceived loads into a single metric that gives you a sense of just how effective your workouts are. You'll have a better sense of whether you're overreaching or need to ramp up the intensity. The pro-oriented Vantage V adds a Recovery Pro system whose daily and long-term tracking help you understand when your body has had enough rest.