Wahoo Fitness Tickr X

Compatible with a ton of well-known applications such as RunFit, and 7 Minute Workout, the Tickr X tracks your heart rate and calories burnt, as well as motion and intensity, which then automatically syncs with your smartphone. However, the Tickr X has inbuilt memory, so, if you forget your phone at home, you can simply sync it later on. Its washable strap means you can sweat to your hearts content, and a battery life of up to 12 months means there’s no need to stress about charging.