From Delta Vee:
Interval Run guides you with vocal feedback through your interval exercise. Select a workout, tap 'Start' and focus on your exercise, not the watch. HIGHLIGHTS: Spoken feedback to notify the user when to switch from walking to running (or 8 other types). Tabata, Couch 2 5K, Gateway to 8K and One Hour Runner programs included. Customizable intervals. The feedback is spoken over your music. Many different voices (coaches) available.