What exactly is Strava's 'Training Impulse'? It is ONLY shown when you hover over a particular ride in the 'Fitness and Freshness' curve, but the term is not defined in the Strava glossary (as far as I can find) and -of course- its not 'Training Load ' (known as TSS everywhere else)) or 'Intensity' (= IF) or 'Relative Effort' (TRIMP). Can't find anything on these boards or via Gogle.
Anyone?
Thx.