Engine Room

Keep the engine in the right RPM. That's the whole job.

Strap: not connected

Your age (sets your numbers):

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no signal
In-zone time (this session) 0m 00s counts up, every second you're in the bands above
Weekly credit earned 0m Endurance = 1 min · Aerobic / Threshold / Max = 2 min each

The 150-minute weekly countdown and family accounts plug into this in the next build — this screen proves the strap and the zone math.