english: Sharpening their claws on nearby surfaces kept them conditioned and ready, helped stretch their back and leg muscles, and relieve some stress, too.
non_english: Brúsenie pazúrov na čomkoľvek v okolí ich udržiavalo v kondícii a pohotovosti, pretiahlo im svaly na chrbte a na nohách, a tiež trochu uvoľnilo stres.