man breasts isnt always cardio
There are health related reasons for men having breasts. For example, there are some men who work out and do all they can and the breasts still stay the same.
This is called Gynecomastia. Its when a hormone balance causes men to grow breasts larger than what a typical man would have or grow. Here is a site to better explain. Just so everyone knows, sometimes you have to think outside the box and realize not everything is related to fitness and eating habits. I often have to explain to people that want to lose weight, not eating is bad because it slows metabolism and further examples of this type.
The human body is a machine and you need to look at it in terms of a science to get true "healthy" results.
Good luck.