Don't buy that. He trains his everyday. And works them extra hard on deadlift day.
Prof X only trains his forearms by just lifting heavy and doing deadlifts and what not.
But, he's also interested in his forearm endurance. So he masturbates at least 5 to 6 times a day with high repping.
I'm just kindding X, we know you only "wrestle the bald headed champ" once a day.
Do like the professor. deadlifts and masturbation. And forget about tempo, work on time under tension. "Shower hour"