With our well-being at the forefront of Sammy’s mind it’s introduced a new S-Health app. Combined with the phones new sensors, the S4 acts as a pedometer to track steps and can even measure ambient temperature and humidity. If the phone isn't with you then the new S-Band can record your steps taken and calories burned. A pretty helpful option if you're off for a jog and don't want to lug the 5in handset around with you. A Body Scale accessory lets you measure your weight to add that to your app's many details about your health, while a heart monitor lets you train within zones for specific goals. That's all great for those training to get in shape but we can imagine, like most fitness kit, it could end up collecting dust in the cupboard. But it does help the S4 join the biofeedback revolution along with the Nike+ FuelBand, FitBit Ultra and new Jawbone Up. Shame it didn’t add the smart data controls in the Xperia Z to help save battery too.