About PN23
Building the operating system for youth sports performance.
Starting With Nutrition
PN23 is a performance nutrition platform built for competitive teen athletes and the parents who support them. We teach the fueling strategies that remove the barriers holding athletes back and show exactly how nutrition drives performance.
We start with nutrition because it's the foundation. Most competitive teen athletes are silently underfueling, creating a performance ceiling that no amount of training can break through. We fix that.
12 modules. Practical systems. Designed for athletes who train 10–15+ hours a week and need fueling strategies that actually hold up when life is busy, practices are long, and games are on the line.
Where We're Going
Nutrition is just the beginning.
PN23 is building the operating system for youth sports performance. Nutrition is the backbone. The foundation that makes everything else possible. But the platform will expand to cover:
- Training optimization and periodization
- Recovery protocols and sleep strategies
- Mental performance and focus techniques
- Injury prevention and return-to-play
- Academic balance and time management
- College recruiting preparation
One place. Every performance edge a competitive teen athlete needs, built on science, designed for athletes who also have practices, games, school, and a life. Nutrition first. The rest is coming.
Built for Competitive Teen Athletes
PN23 is designed for athletes ages 14-18 who:
- Train 10–15+ hours per week in competitive sports
- Compete at club, travel, varsity, or elite levels
- Want real answers, not recycled social media advice
- Are tired of conflicting information that contradicts itself weekly
- Want a system that actually builds, not just content to scroll through
And for their parents who:
- Want to support their athlete's performance goals
- Need practical guidance that fits busy family schedules
- Want science-backed answers, not whatever's trending
- Know that nutrition is a performance lever, not just a health issue
Created by Guy Marshall, RD
Guy Marshall is a Registered Dietitian with a focus on sports nutrition for adolescent athletes. He built PN23 because the information competitive teen athletes need is out there, but it's buried under bad advice, social media noise, and content written for adults. PN23 cuts through that.
His background is in working directly with competitive youth athletes across multiple sports. He knows what underfueling looks like on the field, and he knows what changes when athletes start fueling right.
MS, RD · Registered Dietitian · Sports Nutrition
Ready to Compete Fueled?
Join the beta and be among the first athletes to train with the PN23 system.
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