See, this is some of my own problem. I personally despise going for a walk for the sake of going for a walk. The same for a bike ride. The only times I've enjoyed such things is when part of my unhappiness was at home and it was one of the few escapes available. I don't find these fun at all. Doing actual exercise sounds dreadful and embarrassing. Not to mention that finding basic gear is expensive and hard to find (I'm just talking about a sports bra here - unfortunately, if you are thin with breasts, these get incredibly hard to find and expensive and often must be mail-ordered, which makes them risky).
Yet I'll walk to anywhere within a half an hour's walk. I'll do that daily. Grocery store? walk. I'll go longer at times. I'll take the stairs. I'll go out hiking and walking to see something or do something.
Unfortunately, if I have nothing to see or do - no work or lack the means to do something - I rarely do these things. These have generally been the times when my mental health is worst as well (though that trend has changed the last few years). It makes me despise these sorts of reports.