About
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Built for Endurance. Engineered for Performance.
Most pre-workout supplements were created for bodybuilders—not runners, cyclists, triathletes, and endurance athletes.
They rely on massive doses of caffeine that spike your heart rate, leave you jittery, and often cause an inevitable crash before your workout is over.
Starting Block was designed differently.
Our mission is simple: create a pre-workout that helps endurance athletes perform at their best with clean, sustained energy, enhanced endurance, and sharper focus—without sacrificing heart rate control or feeling overstimulated.
Whether you're logging easy Zone 2 miles, pushing through threshold intervals, or racing toward a new PR, Starting Block helps your body perform when it matters most.
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Why Endurance Athletes Choose Starting Block
Sustained Energy Without the Crash
Feel energized from the first mile to the last with moderate caffeine and performance-focused ingredients designed for endurance—not overstimulation.
Train Longer. Finish Stronger.
Support oxygen delivery and aerobic performance so you can delay fatigue, maintain pace, and keep moving when others begin to fade.
Stay Focused Through Every Workout
Maintain mental clarity and concentration during long training sessions, speed work, and race day.
Recover Faster Between Sessions
Reduce post-workout soreness and inflammation so you're ready to train again sooner with greater consistency.
Hydrate Smarter
Replenish essential electrolytes lost through sweat to support hydration, muscle function, and reduce the likelihood of cramping during long efforts.
Designed for Every Training Day
From easy aerobic runs to demanding interval sessions, Starting Block is formulated to support your entire training cycle—not just your hardest workouts.
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Science-Backed Ingredients That Work as Hard as You Do
Every ingredient in Starting Block was selected because it supports endurance performance—not because it's trendy.
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PeakOâ‚‚®
A patented blend of adaptogenic mushrooms shown to improve oxygen utilization, increase endurance capacity, and support recovery from hard training.
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L-Citrulline
Promotes nitric oxide production to improve blood flow, helping deliver more oxygen and nutrients to working muscles while reducing fatigue.
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Tart Cherry Extract
Naturally rich in antioxidants that help reduce inflammation, decrease muscle soreness, and accelerate recovery after demanding workouts.
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Moderate Caffeine
Provides clean, sustained energy, improved focus, and reduced perceived effort without the excessive stimulant levels found in many traditional pre-workouts.
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Electrolytes (Sodium & Potassium)
Replace key minerals lost through sweat to support hydration, muscle function, and consistent performance in every environment.
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Every Workout Has a Starting Block
You don't need a pre-workout that leaves you wired.
You need one that helps you train consistently, recover efficiently, and perform at your highest level—whether you're preparing for your first 10K, your next marathon, or an Ironman finish line.
Starting Block by Zone 2 Endurance Nutrition is built to help you make every mile count.
