The Slurpee might be a staple of the 7-Eleven diet, but that doesn’t mean there’s not room for improvement. The convenience-store chain is introducing a line of of lower-calorie Slurpees in time for swimsuit season.

Thanks to a new feature of the District’s popular bikesharing program, riders can tell how many calories they burned and what their carbon offset was, both cumulatively and for individual rides.