"Je sais nager, mais je ne fais pas de natation."

Translation: I know how to swim, but I don't go swimming.

[crepe_obsession]

So would "nager" correspond to "marcher" and would "faire de la natation" correspond to "faire une promenade", where the first pair is like a skill/ability and the second is the partaking in the activity?

[Farkas-89]

so, it's not "faire de la natation" because it's a negative statement. Is that correct?

[kligeronic44]

I would say simply " I can swim but i don't".

[dlouwers]

I would love to know the mechanics that make nager into natation here.