Jesus Perez Frias

Jesus Perez Frias is the founder and editor of RepReturn, an independent fitness and recovery-tech review site based in San Jose, California. RepReturn is research-driven rather than a testing lab: products are evaluated against manufacturer specifications, published validation research, independent accuracy comparisons, and long-term owner reports. He tracks roughly 80 fitness and recovery products for pricing, specifications, and availability, and audits that catalog monthly.

Close-up of a woman outdoors checking the time on her smartwatch by a lake.

How Accurate Are Fitness Trackers? What the Validation Research Actually Shows

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Disclosure: This post contains affiliate links. We may earn a commission on qualifying purchases made through them, at no extra cost to you. RepReturn is an independent, research-driven review site, not a testing lab: our picks come from manufacturer specifications, published validation research, independent accuracy comparisons, and long-term owner reports. Bottom line: Your tracker is

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