Appendix A: Glossary - ENDURE Docs

Term	Definition
ATL	Acute Training Load. 7-day rolling average of daily TSS. Represents recent fatigue.
Block	A training phase, typically 4-12 weeks with a specific focus (Base, Build, Peak, etc.).
Compliance	How closely your actual training matched what was prescribed, as a percentage.
CTL	Chronic Training Load. 42-day rolling average of daily TSS. Represents fitness level.
FTP	Functional Threshold Power. The highest average power you can sustain for approximately 1 hour, in watts.
G-Spot	The "gravel sweet spot" — 88-92% of FTP. ENDURE's term for the sweet spot training zone.
IF	Intensity Factor. Normalized Power divided by FTP. A value of 1.0 means you averaged your FTP.
LTHR	Lactate Threshold Heart Rate. The heart rate at your lactate threshold, in bpm.
NP	Normalized Power. A weighted average power that accounts for effort variability. More meaningful than simple average power for interval workouts.
PMC	Performance Management Chart. The chart showing CTL, ATL, and TSB over time.
RPE	Rating of Perceived Exertion. A 1-10 subjective scale of how hard a workout felt.
TSB	Training Stress Balance. CTL minus ATL. Positive = fresh, negative = fatigued.
TSS	Training Stress Score. A single number quantifying the training load of a workout, combining duration and intensity.
VAM	Velocita Ascensionale Media. Vertical ascent per hour, in meters/hour. Measures climbing speed.
VI	Variability Index. Normalized Power divided by Average Power. Higher values mean a more variable (less steady) effort.

Term

Definition

ATL

Acute Training Load. 7-day rolling average of daily TSS. Represents recent fatigue.

Block

A training phase, typically 4-12 weeks with a specific focus (Base, Build, Peak, etc.).

Compliance

How closely your actual training matched what was prescribed, as a percentage.

CTL

Chronic Training Load. 42-day rolling average of daily TSS. Represents fitness level.

FTP

Functional Threshold Power. The highest average power you can sustain for approximately 1 hour, in watts.

G-Spot

The "gravel sweet spot" — 88-92% of FTP. ENDURE's term for the sweet spot training zone.

Intensity Factor. Normalized Power divided by FTP. A value of 1.0 means you averaged your FTP.

LTHR

Lactate Threshold Heart Rate. The heart rate at your lactate threshold, in bpm.

Normalized Power. A weighted average power that accounts for effort variability. More meaningful than simple average power for interval workouts.

PMC

Performance Management Chart. The chart showing CTL, ATL, and TSB over time.

RPE

Rating of Perceived Exertion. A 1-10 subjective scale of how hard a workout felt.

TSB

Training Stress Balance. CTL minus ATL. Positive = fresh, negative = fatigued.

TSS

Training Stress Score. A single number quantifying the training load of a workout, combining duration and intensity.

VAM

Velocita Ascensionale Media. Vertical ascent per hour, in meters/hour. Measures climbing speed.

Variability Index. Normalized Power divided by Average Power. Higher values mean a more variable (less steady) effort.