I like achievements concept at Strava. One thing is how you have improved a performance. But something the biggest achievement is actually that I managed to do the training - simply because the motivation is low.
So my idea is to have make "achievement" called "You did it" (naming is open for better suggestions) where you can identify a session as a session were you did "beat" the motivation and can celebrate that you did the effort - even though you were not motivated.
