Interval/HIIT Workout App with Haptic Notifications

Has anyone found a good interval/HIIT app that uses haptic notifications on the watch.

I really like Intervals for the iPhone, but the watch app doesn't use haptic notifications.

I found Silo, which does use the haptic on the watch, but it is very limited - 6 exercises and only one workout. A rest period uses one of the allotted exercises.