Background information
Breezelabs: Swiss start-up measures running performance via headphones
by Siri Schubert
This fitness device is all about getting your upper body in shape
13/1/2026
Translation: Patrik Stainbrook
The Eggspander might look like a simple hand trainer, but it does a whole lot more. Not surprising then that it won two prizes at the international sports trade fair ISPO.
Like plenty of people, lawyer and tax consultant Dr Kai Sauerwein used to spend hours at his computer every day. And like many, his body reacted with tension and poor posture.
Looking for ways to activate his body during the day, he came across hand muscle trainers. But he still wasn’t satisfied. Most trainers only target a few muscles in your hands and forearms, and he quickly became bored with them. So, he got to work designing an alternative: the Eggspander.
Source: Siri Schubert
A mini trainer for the upper body
The Eggspander consists of two plastic plates connected by a hinge and three springs, which can be removed individually depending on your desired resistance. Its special feature? This fitness device is squeezed between the palms of both hands. Most conventional hand trainers only work on one hand at a time.
The Eggspander’s two-handed squeeze activates a whole range of upper body muscles. According to the manufacturer, 85 per cent of the muscles in your arms, chest, back and torso are covered. Romeo Jackson confirms this. He’s part of the development team, debuting the device at the international sports trade fair ISPO. He’s an expert in functional strength and a four-time Mr Holland Bodybuilding Champion.
Source: ISPO
The Eggspander won two prizes at ISPO: the ISPO Jury Award and the Public Choice Audience Award. The ISPO jury particularly praised its two-handed operation, versatility and compact, lightweight shape.
First impressions
In the time since the event, I’ve been able to get a first impression of the Eggspander myself. It’s a winning concept: when I squeeze the device between my palms, I can feel the muscles in my upper body working. Depending on the position of my arms, either my chest or back muscles are prioritised. You’ll find training videos on YouTube for added inspiration.
To me, the Eggspander is less of a gym substitute and more of a gadget that’ll sit on my desk and remind me to take short exercise breaks every now and then. After a mini-workout, my posture improves and I feel more alert.
However, the Eggspander is a bit big for my hands. I’d like to see different sizes come out in the future. Luckily, Kai Sauerwein announced innovations in an interview at ISPO. Maybe we’ll even get a small and medium version.
The Eggspander is a new device that just debuted at the ISPO sports trade fair. We currently don’t have the Eggspander in our range. If that changes, you’ll find out here.
Header image: Siri Schubert
Siri Schubert
Senior Editor
Siri.Schubert@digitecgalaxus.chResearch diver, outdoor guide and SUP instructor – I love being in, on and around water. Lakes, rivers and the ocean are my playgrounds. For a change of perspective, I look at the world from above while trail running or flying drones.
Background information
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