New York-based personal trainer and fitness personality Gerren Liles believes it’s not what you look like that matters, but what you see.

Liles first entered the personal training industry as a client, when a health scare forced him to reevaluate his overall fitness. In the years since, he founded his own training company, Vision Fitness, became a master instructor at Equinox Fitness Clubs, and served as one of the founding instructors for MIRROR.

We are thrilled that Liles has partnered with Healthline as one of the first featured instructors in Fit It In, an original video series of 22-minute workouts to help you fit fitness into your everyday life.

Reap the metabolic benefits of high intensity interval training (HIIT) with this high speed heart-pumping workout, suitable for intermediate-level athletes and beyond.

Coming soon! Check back weekly for new Fit It In workouts.

Coming soon! Check back weekly for new Fit It In workouts.

Coming soon! Check back weekly for new Fit It In workouts.

For more 22-minute workouts, check out Fit It In on Healthline.com, and subscribe to Healthline on YouTube.