Case Study 06/06

Lilt is simple target heart rate training software for music lovers.

There is a distinct difference between “working out” and “training.” Working is perpetual. Training on the other hand has a singular objective — a goal. The goal could be anything from a summit to a target time to a coveted ski line. Each workout, in theory, is a step along a progression toward the goal.

Through informal interviews and training insight, our team found recreational running, in particular, lacked a purpose. In addition, we knew nothing was more common than listening to a favorite playlist while going for a run. We paired these insights to build a piece of software that used a runner’s favorite music to help them train more effectively.

We built Lilt.


Our team narrowed focus on a metric that could be a guidepost for each and every session: target heart rate.

Every workout from a quick jog to hill intervals has target heart rate zones for maximum training efficiency. Lilt used a runner’s music to deliver constant auditory feedback to gently guide runners into that target heart rate zone. If a runner was within their target heart rate zone, their music sounded perfectly normal. Lilt adjusted the playback if, and only if, they were above or below their target. 

A runner’s heart rate was monitored by pairing a Bluetooth heart rate monitor to their mobile device. As a runner started his or her run, their playlist started with them. They were prompted to select a target heart rate zone based on the objective of a specific training session. With these inputs, the software gently adjusts the playback of their playlist until a runner settles into the target heart rate zone for their work out. The result is a persuasive software platform that enables a thoughtful training session.

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The interface was designed such that the most pertinent information was available to the runner. And usable when running. In addition, the interactions were designed to be state dependent. Based on the action of a user, dominant interface controls change.

Get in your zone.

This software is patent pending and intellectual property of Dundee Venture Capital and Phenomeblue.

Agency: Phenomblue Innovation

Project: Lilt

Assets: Target heart rate training software.

Role: Creative direction, product design, interface design