I recently started lifting weights again...and this time around I'm incorporating cardio with the weight training. I'm a young guy (25) and am in pretty good shape even though I haven't necessarily kept up with any form of training regimen. I'm what you would call a mesomorph I guess. Anyways I've read that it is best to do my weight training first to avoid fatigue, and then tackle the cardio portion. I'm fairly accustomed to lifting regimens as I have lifted seriously several times in the past. I've been doing my normal regimen i.e. Back and Biceps, Chest and Tris, Shoulders and Legs and doing cardio every day. I do the workouts every other day. I've been pushing the cardio pretty hard. I've never incorporated this in the past and want to know what a good amount would be? Been trying HIIT on several different machines, and really like the fact that it pushes me to really get after it. Any suggestions greatly appreciated...