This is the 16513th most frequent Russian word.
сапсерфинга
"Сапсерфинга" refers to "stand-up paddleboarding."
In this sentence, 'сапсерфингом' is used in the instrumental case to express engagement with the activity.
Я недавно увлёкся сапсерфингом.
I recently became interested in paddleboarding.
Here, 'сапсерфингу' is used in the dative case to indicate direction towards the learning of the activity.
Где можно научиться сапсерфингу?
Where can one learn paddleboarding?
In this example, 'сапсерфинга' is in the genitive case as part of the phrase indicating the intended purpose or category of the board.