Six pack with a smartphone: Slendertone's new gadget will please both fitness ...

Mirror.co.ukSix pack with a smartphone: Slendertone's new gadget will please both fitness ...Mirror.co.ukThe likes of Jawbone, Fitbit and even Apple have released wearable gadgets dedicated to making you fitter, stronger and healthier. And now Slendertone has unveiled a toning belt that uses a dedicated smartphone app to become your new personal trainer.