My cardio on tren consisted of walking to the water fountain, masterbating every hour, and fucking when she'd let me. All of which I would get very winded at.
I do NOT do cardio on tren.... I can't.... I've tried.... I get winded walking up stairs and damn near die after sex .... no cardio on tren for me... but the good news is, at least looks wise, you don't need it while on tren.
I admire those who can still do cardio on tren.... from a distance.
As all the bros said it will kill your cardio. I can manage maybe 15-20minutes of walking but other than that it a no go. Nice thing about tren is that if your diet is good you will reap the benefits of it. It will cut you up and harden you out like no other thing known to man and some space aliens.