The erg, or ergometer, is an indoor bike that indicates the amount of energy expended during cycling in watts. Well-made ergs feature large flywheels, precise resistance ratings, and digital displays for testing VO₂ max, FTP (Functional Threshold Power) testing, and pace drills. Athletes who specialize in endurance utilize ergs for indoor training, testing of performance, and timed intervals, which pace effort regardless of external conditions.
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