Kicking off Wahlberg Week with UNDERDOG! 🔥 . . Underdog is a cardiovascular endurance workout that will challenge both the top dogs and the underdogs. Work your way down the line of moves hitting a chest overload after each set! Watch out for those ERG machines!! Go for MAX METERS and input your results in the Challenge App! . . #underdog #wahlbergweek #markwahlberg #f45 #f45training #f45wahlbergweek