Training Effect — aerobic + anaerobic impact (Firstbeat)
Compute the aerobic (TE-A) and anaerobic (TE-AN) training effect of a session, Firstbeat / Garmin / Polar style. Tells you what system each session actually trained.
TE 1-2 = recovery. 2-3 = maintains fitness. 3-4 = improves fitness. 4-5 = strong improvement. 5+ = overload (use sparingly).