I like exercise that is also something else and isn’t purely exercise for its own sake. Things like hiking, where I get to see scenery and animals, or biking, which serves as a mode of transportation. Currently, I do renaissance fencing, which is fun and social in its own right, and I get to master a skill.

“The length of the path travelled by light in vacuum during a time interval of ⁠1/299792458⁠ of a second, where the second is defined by a hyperfine transition frequency of caesium.”

This is the actual definition, but it’s also pretty weird.