Daily Burn, the online fitness brand owned by IAC, launched a new iPhone app today devoted to the popular workout style known as HIIT (high-intensity interval training).

Daily Burn already offers a general training app, but the company says it’s planning a whole series of vertical workout apps, starting HIIT Workouts. The is “bringing personalized workout training to every member tailored to their interests.”

If you’re wondering exactly what HIIT is, the individual exercises may be familiar, but as a DailyBurn article puts it, it’s all combined into “quick, intense bursts of exercise, followed by short, sometimes active, recovery periods.”

There’s no shortage of HIIT workout apps, or HIIT workouts in broader fitness apps (for example, I’ve tried out several through my Fitbit Coach subscription). But Daily Burn points to the combination of guided video workouts (so you’re less likely to mess things up) with a specific focus on HIIT. Plus, the workouts are tailored to your goals and endurance levels.

“We spent months researching how people interact with their phones, and combined it with Daily Burn’s world-class fitness and streaming expertise to create a best in class HIIT app that is effective and fun,” said Daily Burn CEO Tricia Han in the announcement. “With personalized workouts led by expert trainers and optimized for mobile, members have access to top instructors, progress reports and a supportive community in the palm of their hand.”

HIIT Workouts by Daily Burn offers a free, seven-day trial, then costs $9.99 per month.