Mark Wahlberg, the actor known for his 4 a.m. fitness routine, has launched a new YouTube series called the "4AM Club Challenge" where he invites various content creators to his gym to try and replicate his routine, which includes over a dozen exercises. Wahlburg, who admits his routine is intense and involves a three-minute ice bath to get his muscles ready. He also shared his advice for people seeking to gain muscle in certain areas, stating that if you ignore these areas, look at them every day.