. In motion-control and stability shoes, the heel counter commonly reaches further down the inside of the shoe to help control overpronation. Impact ForceWhen your foot hits the ground, the force that travels through the leg is about 2.5 times your body weight
of it's weaknesses, the RS800SD is a serious bit of kit that will definitely help your training. You can keep it simple and just use a basic mode to record your run data. Or if you are prepared to put in the effort, create customised heart rate training
