Countdown Interval Timer paces your workouts from the Microsoft Band or Windows 10 device

[Windows Central]

Countdown Interval Timer is a fitness app available for Windows 10 PC and Mobile that is designed to help you pace your fitness activities. Developed to be useful for high-intensity interval workouts such as Tabata, Countdown Interval Timer can operate from your PC or phone, as well as being connected to your Microsoft Band 2 to receive vibration notifications.
Countdown Interval Timer has an easy to use interface and a free trial version. The full version of Countdown Interval Timer is budget friendly, priced at $0.99. Countdown Interval Timer may not be the flashiest fitness app in the Windows Store, but it does its job rather nicely.

Full story from the WindowsCentral blog...