hi guys, pharmacist. (not being a hero, just saying)
for the most part, the damage you will do to your heart from being on roids will come from heart enlargement (ventricular wall thickening, and overall stretching of the walls of the heart) as well as the damage done your arteries by having high cholesterol (it makes them thicker, and less stretchy, meaning that they dont have the 'give' that they ought to have, meaning that overall, blood pressure will tend to spike/rise more easily)
another source of damage is having high electrolytes (mainly due to estrogen) which will in turn give lead to holding more water, which again will lead to having high blood pressure)
so. what will cardio do? itll improve oxygen delivery (which is good, so that your heart has an easier time of things when demands are placed on it) and will hopefully keep your bodyfat in check (which hopefully will bring your triglycerides and cholesterol down, which as we discussed earlier, will therefore mean that arteries etc wont get as hard...this is good) cardio will also likely maintain healthy blood flow to the heart tissues itself, which is a good thing, and will help decrease the chance of occluded vessels leading to a heart attack.
im sure there are a few more benefits i could think of, but my sleeping pill is kicking in, meaning im jelly in a few minutes

so someone remind me to come back and edit this.
overall though, cardio is a good idea, though controlling your blood pressure and cholesterol is even better.
cheerios
