Engadget - The French didn't only invent the guillotine. They also bequeathed us something even more painful (though that's hard to prove): "Les trois sports", aka the Triathlon. A swimming-cycling-running succession of pure hurt, which Polar's latest RCX5 training computer seeks to measure using an array of sensors -- much like its rivals the Garmin Forerunner 610 and Timex Ironman Global Trainer. You can buy the RCX5 now for $350 in a basic pack, which includes the watch plus the WearLink+ Hybrid, an amphibious chest-strapped heart rate monitor.
