Daddy’s home — and he’s working out at 2 a.m. For many, Sunday is built for sleeping in, eating brunch and easing into the coming week. For Mark Wahlberg, when the clock strikes 2 on the Sabbath, it’s time to boogie to the gym. The 53-year-old movie star, entrepreneur and father of four used to be fond of the 4 a.m. workout. Now, he has taken the early-bird ethos to another level, revealing his extreme — and extremely early — workout routine in a new Instagram video. “My week starts on...