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31.
CIRQA loses 20–30 bpm in open water versus Apple Ultra 3 and WHOOP; wrist optical unfit for swim.
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32.
CIRQA fit and feel observations; too shallow for a core gear choice if accuracy is uncertain.
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33.
CIRQA replaces Polar SENSE in reviewer's kit; interesting rationale but niche to his testing workflow.
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34.
Runna's automated pace adjustment for heat could simplify training in tough conditions, but relies on forecast data rather than measured physiology.