I never do cardio, only for about 5-10mins before a training sesion thats it, i want to do a bit of cardio to strengthen my heart but I dont want to lose any weight, I drop weight easy, I can rip up no problem, its a bit harder for me to gain muscle, thats me in the avatar(bad pic, from a cellphone), Im fairly lean and my diet isnt that clean, anyways how much cardio do you think I can get away with before I start to lose weight?