ZumXR™ (XR Caffeine)
Best Used For:
Power & Strength
Athletic applications requiring a power or strength component.
Workouts requiring a focus boost.
Great For Everyone
Any situation in which energy is needed.
- SUPERCHARGE YOUR WORKOUTS. HARNESS contains key ingredients demonstrated to increase measures of athletic performance.
- FOCUS and ENERGY. HARNESS’ energy matrix emphasizes clean, sustainable, and beneficial energy over pure stimulation. Our specific combination of two forms of caffeine anhydrous results in less of the dreaded “crash.”
- GREAT FOR EVERYONE. HARNESS has been formulated to address a wide range of athletic needs. HARNESS is perfect whether you’re an aspiring marathoner, a crossfitter, or someone just trying to get in shape.
- DELICIOUS TASTE. In seven innovative and delicious flavors, you’ll never dread drinking your pre-workout again. No chalky texture or bitter after taste.
- 5-STAR REVIEWS with MONEYBACK GUARANTEE. HARNESS’ average rating is 4.9 with hundreds of reviews. Our quality is backed up by a 100% moneyback guarantee.
We didn't just stamp Julian Smith's face on the brand. He uses Arms Race Nutrition stacks everyday to power his training and maximize his success.
Julian Smith’s old-school, no-BS dedication to training, with the modern science of dietary supplements.
Specifically selected to
Maximize Your Success
Every ingredient, every formula has been specifically selected to maximize your success.