Keiser
Pneumatic resistance — strength training without the iron.
What they're known for
Air-pressure resistance machines that load muscle smoothly and safely — a power-and-rehab standard since 1978.
Keiser has built pneumatic-resistance equipment in Fresno, California since 1978, replacing weight stacks with compressed air. The benefit is physics: air resistance has almost no inertia, so it loads muscle smoothly through the full range and can be changed instantly mid-rep — ideal for explosive power training, and gentle enough for rehab and older athletes.
That dual profile — elite power development and joint-friendly rehabilitation from the same machines — is why Keiser shows up in pro sports performance centers and physical-therapy clinics alike. The M3 indoor bike is the consumer-famous product, but the functional trainers and pneumatic strength line are the core. The specialist's pick when how the resistance behaves matters more than how much iron is on the bar.
Notable products
We haven't catalogued their full line in the directory yet. These are the entries worth knowing.
- Catalog entry
M3i Indoor Bike
Magnetic-resistance studio bike with a cult following
- Catalog entry
Functional Trainer
Pneumatic dual-adjustable cable trainer
- Catalog entry
Infinity Series
Pneumatic strength machines for power and rehab
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