What is Strava's 'Training Impulse'?

[slogfester]

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.

[clyde · Accepted solution]

Hi there! 

Training Impulse is based on this https://www.trainingimpulse.com/banisters-trimp-0. Our Relative Effort was inspired by the concept of TRIMP (TRaining IMPulse) coined by Dr. Eric Banister. Several years ago we posted a blog article regarding the Fitness & Freshness chart and how the 'suffer score' (now called 'relative effort') and training load are represented on the chart. If you'd like to check out that article to learn more: https://medium.com/strava-engineering/fitness-freshness-updates-5d1057d67fac

[slogfester]

Thx. Would be great if the definition was added to the Strava Glossary.