About us

Made for hard workers.

My name is Niels Koster, founder of SWEAT & CALLUSES. Strength training has been a major part of my life for as long as I can remember. I started out in commercial gyms, but over the past years CrossFit® has become central to both my training and my work life.

Alongside running this brand, I work as a CrossFit coach, spending countless hours on the gym floor (often literally on the floor) — coaching athletes, refining movement, and seeing firsthand what gear actually holds up under real training conditions.

SWEAT & CALLUSES started with a simple idea: build training gear that performs where and when it matters — in the gym or box, under load, and over time.
No shortcuts. No inflated branding. Just functional, high-quality, durable gear shaped by daily use and athlete feedback.

Training isn’t a trend or a quick fix. It’s a long-term commitment built on consistency, effort, and showing up even when it’s uncomfortable. That’s what this brand represents — and who it’s for: hard workers.
Sweat is earned. Calluses are proof.

Our gear

It started with our gym backpacks — designed to survive daily abuse, heavy loads, and long training days. These aren’t accessories; they’re tools, built to carry everything your training demands.

As a coach and athlete, every product is battle-tested in real training by myself and other athletes.
If it doesn’t meet our standards for functionality and durability, we don’t use it — and we don’t sell it. It’s that simple.

Today, our range also includes lifting accessories like wrist wraps and lifting straps, with more gear in development — all built by the same rule:
if it can’t survive hard training, it doesn’t make the cut.

Community & connection

Whether you train bodybuilding, CrossFit®, HYROX, powerlifting, or weightlifting — if you show up with intent, you belong here.

Train hard. Stay consistent.
Wear your sweat and calluses with pride.