I AM 65 YEARS OLD,I HAD ANGEOPLASTY FOUR WEEKS AGO AND A STENT IS PLACED,AFTER ONE WEEK I STARTED MY WALK AND NOW I AM DOING 4 KILOMETERS WALK EVERY DAY FINE AND EASY, MY QUESTION IS WHEN CAN I START MY,PULLUPS,PUSHUPS AND OTHER EXERSICES WITHOUT WEIGHT. AND HOW MUCH CAN I DO...THANKS