What is the science behind the ONYX Method?

At ONYX, we go straight to the source: Type I slow-twitch muscle fibers. Why? Because they’re all about endurance, stamina, fatigue resistance, and strength—everything you need for a body that lasts longer and stays stronger. These fibers are oxygen-loving machines, helping you power through low to moderate-intensity work for the long haul.

By dialing in on slow-twitch training, we’re not just boosting your muscular endurance and cardiovascular health; we’re building a foundation that supports everything from your toughest workouts to daily life. Our method sculpts, elongates, and fortifies your body—leaving you strong and balanced, without the bulk or breakdown.