I find I have to do cardio on my off days because if I do it before I train legs, my legs will be too tired to lift heavy, and if I do it after I won't be able to move my legs fast enough to get my heart rate up. Also, I find that I can't really do cardio the day after I train my legs because they're too sore. So that takes out 2 days of the week for cardio. What do you guys do, do you dodge these 2 days (legs day and the day after) for cardio?