vežbanje

1. practice; practising
   Bez vežbanja nema napretka u jeziku. — Without practice there's no progress in a language.
   Za sviranje klavira potrebno je mnogo vežbanja. — Playing the piano takes a lot of practice.
2. exercise; working out
   Svakog jutra posvetim pola sata vežbanju. — Every morning I spend half an hour exercising.
   Redovno vežbanje je dobro za srce. — Regular exercise is good for your heart.

Vežbanje is the activity; a single exercise is a vežba.