For performance-driven runners, there is the Garmin Forerunner 970 GPS running and triathlon smartwatch with a bright AMOLED display, durable sapphire lens, lightweight titanium bezel and built-in LED flashlight. Understand your overall energy efficiency with running economy, and see how much you are slowing down with step speed loss (HRM 600 monitor required; sold separately). Running tolerance tells you how your training habits have prepared you to handle your current and future impact load so you can keep training effectively without taking on too much. Use multi-band GPS and full-colour, built-in maps plus navigation enhancements to stay on track while you train.