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For a barbell bench press, for example, if you push the weight fast for the first half of the move, the barbell will become lighter, perhaps even weightless, during the second half of the motion due to momentum.
By comparison, with pneumatic resistance, no matter how fast you move, the resistance stays the same.
So why swap traditional stacked weights for the unseen?
“Pneumatic machines are the closest you’ll get to true isotonic exercise,” (or moving a fixed amount of resistance through a specific range of motion), says Andrea Hudy, strength and conditioning coach at the University of Kansas.
This combined with smooth fluid movements make it a safe exercise system for nearly any practice.