Cardio & conditioning
Decision path
We start with what the equipment does, compare the trade-offs that matter, then assess individual products. Retailer descriptions are a source to verify, not our verdict.
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No. Controlled trials show the mask does not mimic altitude: it does not raise how much oxygen your blood carries or beat ordinary interval training, and in one trial wearing it made people stop sooner from breathlessness. At most it works the breathing muscles.
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