I have low blood pressure and heavy cardio just takes it out of me, but I do love walking. (thefoxandshe.com)
So the best training program will be a mix of heavy cardio and interval training with intense bodyweight training. (liftingrevolution.com)
For example, I will do most heavy cardio excercises (swings, clean and presses, etc.) with a 35, but something like a swing / catch / squat / press with a 55, and standard presses, around the body and rows with a 45. (onnit.com)