Keiser
Keiser Corporation is an American maker of air-powered variable resistance fitness equipment for sports performance, tactical, medical, longevity and commercial markets.
Last updated September 15, 2026
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Overview
Keiser Corporation designs and manufactures fitness equipment, including air-powered variable resistance machines and indoor bikes. The company states its mission is to improve human performance at all levels regardless of age or physical restriction, and serves sports performance, tactical, medical, longevity and commercial sectors. Its products are made in the USA with domestic and globally sourced material, and its corporate headquarters is in Fresno, California.
History
Keiser's history traces to more than 45 years before the company's own account: Dennis Keiser was hired to design the first variable resistance machines for a leading manufacturer. A year later he launched "Commercial Design", a consulting engineering company specializing in exercise equipment design. In 1976 his brother Randy joined him, and a year later they formed Keiser Corporation. After patents in weight stack variable resistance design and hydraulic resistance design, Dennis applied for patent protection on a new concept for variable resistance using compressed air (pneumatics). In 1978 the brothers introduced the first air-powered variable resistance exercise machines for building strength and power. The company states that more than 80% of the top professional sports teams in the world now train on Keiser machines, including every baseball team in the majors, the soccer champions of nine countries, several American football champions and countless Olympians, along with organizations from NASA to Navy Seals, medical experts and rehabilitation specialists, and major gyms like LA Fitness. It also states that more than 300,000 Keiser Indoor Bikes have been sold worldwide.
Products and positioning
Ultimate fitness equipment for sports performance, tactical, medical, longevity and commercial market sectors; made in the USA.
Air-powered variable resistance exercise machines
Introduced in 1978 for building strength and power.
Keiser Indoor Bikes
More than 300,000 sold worldwide according to the company.
A400 Technology
Listed among Keiser's offerings on its homepage.
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