In short
- 1,500+ SKUs: run jointly by HYROX and VOIDS, across three continents.
- One question: at the start: how do you scale merchandise without operations collapsing?
- 750 people: in San Diego heard HYROX and VOIDS tell the case together on stage.
HYROX is a fitness racing format with events worldwide. The merchandise business grows with the events, online and on site, in more and more markets.
A little over a year ago, VOIDS sat in its first pitch with HYROX. Today the two run more than 1,500 SKUs together across three continents.
Who is HYROX?
| Brand | HYROX, fitness racing format with events worldwide |
|---|---|
| Range | more than 1,500 merchandise SKUs |
| Markets | three continents, online and at events |
| Contact | Jochen Möller, Chief Revenue Officer |
| With VOIDS since | 2025 |
| Founded | 2017 in Hamburg |
| Participants | 1.2M last season, 2M expected |
| Events | more than 100 in 35 countries |
| Logistics | 17 roadshows on 12 trucks, more than 10 warehouses |
| Main partner | Puma, two collections a year |
| Website | hyrox.com |
According to Chief Revenue Officer Jochen Möller (Commerce Roundtable, 2026), HYROX started in Hamburg in 2017 with around 650 participants. Last season there were 1.2 million, and HYROX expects 2 million next season. Puma has been a partner since year one and is still the biggest.
The scale of the merchandise business: more than 100 events in 35 countries last season, 17 roadshows on 12 trucks and more than 10 warehouses. At the New York event alone, HYROX sold around 60,000 merchandise items.
What problem did HYROX have?
It started with a single question: how do you scale a merchandise business without operations collapsing?
Event merchandise is hard to plan. Demand depends on event dates in many countries, stock has to be in the right place on time, and every new country brings new SKUs.
Why weren't spreadsheets enough for HYROX anymore?
With Puma there are two collections a year, and for apparel and footwear HYROX has to invest at least twelve months ahead, according to Möller. At the pace HYROX was growing, it was hard to tell what an event would need a year later. Möller remembers approving 25 million in product investment without knowing whether there was a market for it in that region.
The consequences showed on site: on the second event day, products were sold out or sizes were missing. Sometimes the stock was there, but in the wrong roadshow or the wrong warehouse. At the same time, the risk of overstock grew. The team tried with lots of spreadsheets and, in Möller's words, was fully overwhelmed by the growth.
What did VOIDS change at HYROX?
VOIDS provides HYROX with inventory planning for its entire merchandise: SKU-level forecasts, order quantities for suppliers and allocation across markets.
Jochen Möller and VOIDS founder Jannik Semmelhaack told the story in San Diego in front of 750 people, as brand and partner, including everything that went wrong along the way.
How does VOIDS plan purchasing for HYROX?
According to Jannik Semmelhaack (Commerce Roundtable, October 2026), VOIDS forecasts more than 200,000 SKUs for merchants worldwide. Five things set the forecast apart from an Excel plan: historic stockouts are corrected so demand isn't underestimated. Seasonality and campaigns like Black Week are modelled separately. Every sales channel gets its own forecast. New products with little history are planned with their own launch curve. And cannibalisation between products is taken into account.
According to Semmelhaack, many brands update their plan only every four to twelve weeks. VOIDS recalculates the forecast every week and shows stock, inbound and sell-through per channel for every SKU. Each SKU has a safety period and an order cycle, and the order suggestion follows from them. At HYROX, forecast accuracy was 32 percent higher in a direct comparison with the team's own manual plan.
At the start, VOIDS analyses the last 12 to 24 months for every new customer: how much revenue was lost because stock was missing, and how efficiently is the existing inventory working? That produces the business case the collaboration can later be measured against.
At HYROX, lead time is the core problem: six to twelve months until resupply. The forecast has to be stable and accurate over that horizon, and it drives two decisions: what arrives in the central warehouse and what goes to the roadshows and event warehouses.
When HYROX planned more events for Q4, VOIDS showed within minutes that an important bestseller would run short. A purchase order already placed with Puma was pulled forward. According to Semmelhaack, that saved more than $320,000 on a single decision.
What results did HYROX achieve?
| Metric | Before | With VOIDS |
|---|---|---|
| Forecast accuracy | own manual plan | 32% more accurate |
| Planning basis | lots of spreadsheets | one system, data almost daily |
| Q4 decision | bestseller would have run short | more than $320,000 saved |
| Range | more than 1,500 SKUs | more than 1,500 SKUs run centrally |
According to VOIDS founder Jannik Semmelhaack (LinkedIn, 2026):
- More than 1,500 SKUs run jointly
- Planning across three continents from one system
- Joint talk by HYROX and VOIDS in San Diego in front of 750 people
VOIDS is our single source of truth for inventory. Without those dashboards, the operations simply wouldn't work.
We are not a start-up anymore when we talk about HYROX. We are an absolute start-up when it comes to HYROX merchandising.
The front side looks amazing, on the back side, it's chaos.
Today we run more than 1,500 SKUs together. Across three continents.
What can you learn from this?
- When a business moves into new markets fast, inventory planning has to grow with it, or operations collapse. Multi-warehouse inventory planning
- Event demand can be planned when dates and markets are part of the forecast. Forecasting with VOIDS
- Trust is built in the months before the success: in calls at 10 pm and decisions nobody celebrates.
Sources:
- Jannik Semmelhaack on LinkedIn about HYROX
- Jannik Semmelhaack and Jochen Möller at Commerce Roundtable (YouTube, October 2026)
Frequently asked questions
How many SKUs does HYROX plan with VOIDS?
HYROX and VOIDS jointly run more than 1,500 merchandise SKUs across three continents. The range grows with the events, online and on site, in more and more markets. It is planned centrally in VOIDS, with SKU-level forecasts and order quantities for suppliers.
What question started the partnership?
How to scale a merchandise business without operations collapsing. With that question, VOIDS founder Jannik Semmelhaack sat in his first pitch with HYROX a little over a year ago. Today the two jointly run more than 1,500 SKUs across three continents.
Where did HYROX and VOIDS present the case?
In San Diego, in front of 750 people. Jochen Möller, Chief Revenue Officer of HYROX, and VOIDS founder Jannik Semmelhaack told it together on stage, as brand and partner, including everything that went wrong along the way. Jannik Semmelhaack calls it the biggest talk of his life.
Why is event merchandise hard to plan?
Demand depends on event dates in many countries. Stock has to be in the right place on time, and every new country brings new SKUs. With too little stock on site, the event's revenue is lost. With too much, capital is tied up in leftover stock.
What does HYROX say about VOIDS?
Jochen Möller of HYROX says: "VOIDS is our single source of truth for inventory. Without those dashboards, the operations simply wouldn't work." He is talking about inventory planning for more than 1,500 merchandise SKUs that HYROX and VOIDS run together across three continents.
How much did VOIDS save at HYROX?
More than $320,000 on a single decision. When HYROX planned more events for Q4, VOIDS showed within minutes that an important bestseller would run short. A purchase order already placed with Puma was pulled forward. Compared with the team's own manual plan, the VOIDS forecast was also 32 percent more accurate.
How big is HYROX?
According to Chief Revenue Officer Jochen Möller, HYROX had 1.2 million participants and more than 100 events in 35 countries last season. HYROX expects 2 million participants next season. It all started in Hamburg in 2017 with around 650 participants. Puma has been a partner since year one.
Why does merchandise matter so much to HYROX?
According to Jochen Möller, merchandise reflects the lifestyle around the sport and connects the community. For two years there has been a global product range with Puma, and more licence partners are joining. At the New York event, HYROX sold around 60,000 merchandise items, mainly apparel and footwear.
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Jannik Semmelhaack · CEO & Founder, VOIDS
Jannik is founder and CEO of VOIDS. He writes about AI-powered demand forecasting, inventory optimization, and supply-chain strategy for DTC brands.
Reviewed by Jannik Semmelhaack, founder and CEO of VOIDS.
Jannik checks every article for factual accuracy and practical relevance before it is published.