Im on my third week of Tren A,300mg per week with 600mg T-400 per week,,I take my regular Multi. plus a seperate B-complex and seperate b-12... I did a full 8 week cycle of tren A last fall the same way..I still do 45 min cardio 4 times per week,,and 1hr on treadmill at 4.0 speed at 3deg incline for 1 hr after working legs...I'm not that short of breath,, I do notice a difference since throwing the tren in,,but its not that big of one..except having to change the damn sheets ,,sweating like crazy at night...ready to crawl into my deep freezer..