Soldato
Awesome thanks for the advice Nate
edit: Just had a look at HIIT and its benefits and that seems a very good option, would you suggest I do this for all of my cardio or just a proportion of it?
Depends on your goals, I never got into it, but a lot of people swear by it. I'm happy with Steady State cardio myself. It really is up to you, try it for a while, see what you think.
Just remember that if you want to build mass you must have a calorie surplus, and any type of cardio will be working against this, so don't over do it. I would maintain that some cardio is always needed, just for general fitness, how you go about that is up to you.
Nate