It could be boxing training, but it could also be strength training, or something completely different, such as going bowling or watching a movie or enjoying themselves in other ways in the facilities.
Tað kann vera boksivenjing, men tað kann eisini vera styrkivenjing, ella okkurt heilt annað, til dømis at fara at bovla ella hyggja eftir einum filmi ella hugna sær á annan hátt í hølunum.