The 4iii Viiiiva is a heart rate monitor from a brand better known for its cycling power meters. That doesn’t mean this is one that can’t live away from your bike with the Bluetooth connectivity on board to let you connect it to an Apple Watch and bring it into the Apple Fitness Plus fray. There’s some connectivity extras here if you want to share data to other fitness equipment and it also offers strong battery life to keep you tracking workouts for some time.
