As expected, resting is a no after all. Limbo only nodded and started lifting the weights again. He can actually do more, but he was used to not straining himself as well before missions, his stamina decreases during missions if such happens. However, since he's no longer an assassin of that organization, he has to get used to Vlad's ways and into training again. Do what he must in order to get better and become what Vlad expects all of them to become.