Mark Wahlberg reveals what motivates his 2 a.m. workout routines
SMXRF/Star Max/GC ImagesBy KELLY MCCARTHY, ABC News (NEW YORK) -- For some, there aren't enough hours in the day when it comes to squeezing in a workout. But for Mark Wahlberg, tha…
SMXRF/Star Max/GC ImagesBy KELLY MCCARTHY, ABC News (NEW YORK) -- For some, there aren't enough hours in the day when it comes to squeezing in a workout. But for Mark Wahlberg, tha…