At our gym in Chattanooga, TN, we believe the best results come from balance, variety, and consistency. That’s why we created the X⁴ formula—4 Blocks. 4 Minutes. Each 50-minute class bridges the gap between HIIT and functional fitness, delivering a complete workout that challenges every part of your body while keeping things fresh, exciting, and effective.

Classic: A true full-body session that blends lifting, sprint work, endurance, and core movements for a balanced workout every time.

Strength: Focused resistance training with heavy weights designed to slow things down and build raw power.

Burn: High-intensity intervals combining machines, light weights, and bodyweight movements to push endurance and torch calories.

Flex: Upper-body and core-focused, this class emphasizes higher reps and burnout sets for muscle definition and strength.

Sprint: Explosive, fast-paced blocks built around short, high-effort movements designed to test speed and agility.

Gauntlet: Our signature once-a-month challenge class, packed with energy and culminating in a max-effort sprint to push your limits.

Unlike many group fitness studios, X⁴ Highland Park offers a holistic approach to training by blending aerobic and anaerobic conditioning in every program. You’ll never get stuck in a routine or plateau because each class is designed with purposeful variety. Whether you’re new to fitness or a seasoned athlete, you’ll be supported by expert coaches and an encouraging community that thrives on progress and results.

X⁴ began as a small HIIT class in Homewood, AL, when founder Chris Wade recognized the need for a program that challenged all fitness levels while keeping workouts engaging. Today, X⁴ continues to grow across the Southeast, including right here in Chattanooga, Tennessee—helping members redefine their strength, endurance, and confidence.