Good Morning Texas The science behind Orangetheory Fitness Orangetheory is a heart-rate based HIIT total-body group workout that combines science, coaching and technology designed to boost your metabolism. More Videos Next up in 5 Example video title will go here for this video Next up in 5 Example video title will go here for this video This segment is sponsored by: Orangetheory Fitness Join in June and get your first month free! Got to orangetheory.com. Close Ad