Born from a hydraulic system Mark engineered for freight-rail couplings, Poseidon Strength manufactures U.S.-built strength and rehabilitation equipment that applies isokinetic resistance to functional movement. Its ForceTrain® Tower combines a barbell-like interface with real-time force and velocity data, while the Infiniti Rope brings continuous, controlled rope climbing to training facilities. Co-founders Mark and Brad started the company in a garage and continue to focus on equipment that bridges the gap between rehabilitation and strength training.
Berry Compliant
Compliance program
Keiser CorporationFounded by brothers Dennis and Randy Keiser in 1977, Keiser Corporation manufactures fitness equipment in Fresno, California, using its pioneering pneumatic resistance technology to train strength and speed without the inertia of traditional weights. The company’s American-made machines serve athletes, tactical teams, rehabilitation specialists and older adults, while its M Series indoor bikes connect to digital tools that capture workout data. Keiser also supports its equipment with trainer education, performance testing and U.S.-based parts and service.CINCINNATI, OH
King Strength MFGKnown for equipment that has served prominent facilities around the world, King Strength MFG is an Allentown, Pennsylvania manufacturer whose founders bring decades of experience in professional strength-equipment design and engineering. The company builds American-made equipment for high-use training environments, serving elite clubs, athletic programs, and rehabilitation facilities with specialized pieces such as its John Boos M.A.S.S. line.ALLENTOWN, PA
PRIME Fitness USARooted in the USA and hand-crafted in northwestern Pennsylvania, PRIME Fitness makes strength-training equipment engineered around its SmartStrength® approach. The brand is owned and manufactured by Specialty Fitness Systems, which has been the sole manufacturer of Strive Strength equipment since 2009 and acquired Strive outright in 2013. PRIME’s equipment is made to order, including selectorized and plate-loaded machines, racks, and gym accessories.339920FRANKLIN, PA
HydroWorxHydroWorx grew from Dr. Paul Hetrick’s 1987 prototype, built after he recognized how an underwater treadmill could transform rehabilitation. Founded in 1997, the Middletown-area company now designs, manufactures, installs, and services aquatic therapy systems for facilities seeking safer recovery and movement. Its own technicians provide continuing support, while the company’s technology is used daily by more than 30,000 people worldwide.339920MIDDLETOWN, PA