Muscle bound Matthew McConaughey doesn't take his exercise regime lightly - quite literally! Splash spied the fitness fanatic as he trained with his instructor in Malibu wearing a weighted black vest. This isn't the first time we have snapped Matthew with his heavy pack on, and it's left us wondering - is this a sympathy vest for his pregnant girlfriend Camilla Alves!? 

Note to Matthew: Next time job without your t-shirt on, some of us have a day of work to get through!!