Learn

Understand the values behind your training. Each explanation documents the calculation used by EffortSignal, a worked example and the data it needs.

Activity Metrics: Work, Efficiency and Intensity Minutes

Understand mechanical work, output per heartbeat, relative heart rate and intensity-minute credit.

Aerobic decoupling compares output per heartbeat in the first and second halves of suitable recordings.

ATL is the faster-moving average of daily cardiovascular TRIMP load.

CTL is the slower-moving average of daily cardiovascular TRIMP load, shown as Fitness.

The easy-load estimate solves the product's ATL and CTL recurrences for an equal next updated state.

eFTP is a constrained estimate from cycling power-duration evidence, separate from the configured FTP.

These Dashboard summaries describe the distribution and amount of TRIMP over seven consecutive daily rows.

Planned load estimates the authored structure. It does not run the completed-activity sensor formulas in advance.

Power Intensity expresses Weighted Power relative to the applicable power threshold.

Power Variability compares Weighted Power with average timer-running power.

PSS combines timer duration with weighted power relative to the applicable FTP.

Readiness combines baseline-relative HRV, resting heart rate, sleep and workload. It is a model with explicit missing-data gates.

Follow the exact path from recorded heart rate to daily TRIMP, ATL, CTL and TSB.

TRIMP estimates cardiovascular training load from duration and relative heart rate.

TSB, shown as Form, is the difference between chronic and acute load entering a day.

The weekly usual range compares a completed week with eight immediately preceding complete weeks.

Weighted Power gives variable power a fourth-power-weighted summary over complete 30-second windows.

The Dashboard workload ratio compares the current ATL with CTL from the same TRIMP history.

Zones classify measured output or heart rate using the athlete settings applicable to the activity.