Garmin watch forerunner 630 black 010 03717 20 whether you are training for your first marathon or looking to crush a personal record forerunner 630 provides all the extensive data you need for training and racing check your form by pairing your 630 with the hrm run monitor to measure cadence vertical oscillation and ground contact time additional running dynamics include ground contact time balance stride length and vertical ratio giving runners insight into how efficient and how balance