I want to concentrate on my legs, only, for a while and I can't remember how the days of rest for the muscles go. If I train them on let's say Monday, can I train them again on Wednesday or do I have to wait until Thursday? I plan on doing 3-4 days of cardio so on the days I don't do cardio I want train my legs. I may even do legs and cardio on the same day, but like I said i can't remember the "resting" rule. Thanks for your help!