Enable 'Dark Mode' so Training Peaks is easier on our eyes
Most computers and screens allow for 'dark mode' where the background is black and text is white. I have all my computers and screens set up this way and it's increasingly obvious how much harder Training Peaks is on my eyes vs other apps that switch to dark mode when that's the default setting for the computer. Allowing for this option would be a welcome improvement for many of us!

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Mike commented
Not only is it a functional feature helping with strain on the eyes, but from a branding standpoint, it just elevates the perceived value of the brand. Users are paying a premium for your service, and a well-designed dark mode would give the brand a more premium feel. I'm willing to bet that if you made a really nice-looking dark mode and only made it available to premium users, you'd get more conversions.