hey have been out of the bodybuilding seen for a couple of years now., im 37 years guys i old and am about 20 llbs overweight. in my earlier days i use to lift heavy and was always bulky. then and now i find myself huffin and puffin going up a flight of stairs, really embarrasing, just wanted to know how to get my cardio in order not just to lose weight but to improve my aerobic capacity, i was wondering about doing the hitt program but i dont know ,anyone that can suggest a aerobic plan with all of the ways on figuring out the percentages because i never did that would be appreciated thank you