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.