Interval Training App 1 Professional

The Interval Training App 1 Professional, running on most Connect IQ™-compatible Garmin devices, supports you in improving your aerobic capacity and permitting you to exercise for longer and/or more intense levels by tracking the most important parameters like distance, speed, pace and time with high sensitivity GPS. Additionally ANT+™ compatible sensors for heart rate, foot pod, cadence and speed monitoring are supported. It is designed as a watch app (and not a data field) for following reasons:

Simple to install and use
Arbitrary feature enhancement possible
Circumvent that some watches (e.g. vivoactive™) can only display two Connect IQ™ data fields

Link to Interval Training App 1 Professional on Garmin App Store

This website provides further information regarding requirements, installation, getting started, supported data fields and features as well as frequently asked questions.