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Physiocity Academy of Rehabilitation Sciences on Instagram: "An Incentive Spirometer mainly helps you breathe in deeply — it trains your inspiratory muscles and keeps your lungs open after surgery. But with some techniques, it can also be used to train the expiratory muscles. The difference is a PEP device works when you breathe out against resistance, while an Incentive Spirometer works when you breathe in to lift the balls or piston. So simply put IS is for inspiration, PEP is for expiration!”