ABOUT BYF
BYF is a carbohydrate gel mix designed for athletes who need reliable intra-workout fuel without the high cost of traditional single-use gels.
Our current carbohydrate formula uses a 2:1 ratio of sucrose to fructose, giving you a practical source of carbohydrate to mix and carry with you during training and racing.
But what makes BYF different isn't just what's inside the mix — it's how you use it.
Instead of carrying a pocket full of individual gels, simply mix your BYF and fill a reusable soft flask. Take smaller amounts whenever you need them throughout your session or race, rather than opening a gel and feeling like you need to consume the entire sachet at once.
MEET THE FOUNDERS LESLEY & RUSSELL
Build Your Fuel was born out of necessity.
We are Lesley and Russell — competitive age-group athletes who spend a lot of time training, racing and, quite literally, fueling.
Between us, we've competed and podiumed multiple times in HYROX, both individually and as mixed doubles. We qualified for the 2026 HYROX World Championships, and although we weren't able to attend, we're already working towards our next goal — qualifying for the 2027 HYROX World Championships in Hong Kong.
And we're not stopping there. We're currently training for a marathon, an Ironman 70.3 and a 50km ultra later this year to celebrate our 54th birthdays.
With all that training came one very obvious problem — fuel costs.
We were spending an incredible amount of money on carbohydrate gels and constantly buying boxes of individual sachets just to keep up with the amount of fuel we needed. We started asking ourselves a simple question:
Why are we paying so much for something we could make ourselves?
So we started researching, experimenting and testing different carbohydrate combinations and ways of carrying our fuel. What began as a way to save money became something we genuinely loved using ourselves.
And that's how **Build Your Fuel — **BYF — was born.
We wanted to create a simple, effective and affordable way for people who train and race regularly to take control of their own fueling — without the expensive individual gels, excessive packaging or artificial flavours.
If we were looking for a better way to fuel ourselves, we figured other athletes probably were too.
