Actually he does LOADS of cardio, besides training with the Real Madrid squad daily, when he gets home, he has a heated pool for swimming in his house and he also has a machine that allows you to run without applying any pressure to your knees (in portuguese I`ve heard people call it NASA machine, not sure how it works tho). This much cardio is what allows him to run almost 100m in 10s by the 87' mark, as he has a few times haha