I'll bet there is a curve. My own experiences cycling suggest that a little bit isnt helpful. A good amount is energizing, and too much is exhausting. For me those attachment and detachment points are probably [0;8;20]. Your mileage will absolutely vary.
A great exercise would be to find some causality from Strava data and git commit, both of which I have fairly extensive data on.
I slept pretty well and feel healthy and energized today and doing the dishes was easy this morning, but it's totally contrary to my entire life experience to claim that doing something physically tiring gives you more energy afterward.
Not that doing nothing all the time feels good— humans just don't have unlimited capacity for output. Taking a leisurely morning walk (or a moderate-distance bike commute) certainly gets my day started on the right foot, but going harder faster longer at physical activity makes me physically tired and less capable of doing other things.