Isometric exercises have been recommended by many coaches for building strength. With the Activbody Activ5, you have an easier way to try these moves. This is an isometric-based device that coaches you through a 5-minute low-impact workout. Just bring your iOS or Android smartphone, and you are ready to try more than 100 unique workouts.
The app shows your strength and other data. Activ5 is capable of measuring more than 200 lbs. of force. It connects to your smartphone via Bluetooth and has 6 months of battery life.