Do bodybuilders do cardio every day?

Bodybuilders very seldom do cardio. They focus almost completey on the weights. So if you ever make a bodybuilder mad you have a good chance at running away.

Typically about 3 months out from a show they will begin doing cardio up to usually about 2 and a half hours a day split into two sessions. Though it does depend on the bodybuilder. However throughout the rest of the year cardio is kept to a minimum or not at all.