I trained weds,thurs and friday (i feel burned out!) i'm taking saturday and maybe sunday if needed to rest/recover onthe sunday i may do a slow run
Rest is recovery, where your body comes back stronger from what you put it through in training. Without it, you're just burning yourself out without getting the returns.
Depends on how much time you have to spend on work, school etc. If your in college and you decide to take 1 or 2 years longer because you want to focus on boxing and you dont work.. well then you can do 9 - 12 1-2 hour workouts a week I think. (running, weights, boxing). All the other time you can sleep and eat healthy and go to school now and then. If you not in that position you have to train less. Maybe just train 3 times a week. Boxing training got priority tough. So yeah rest is important. But there is a saying: "He who fears doing to much always does to little".
Let's say you're training fairly intensely for boxing, which is what guys on here should be doing really.
I trained Monday Wednesday thursday friday and had hammer throw practice for college everyday meets on saturday so much rest was needed atleast atleast 7 hours of sleep a night take a day off you deserve it and so does your body 24 hours no lifting no training my day off is sunday but i also do nothing after work so tuesday is pretty good too rest is just as important as being awake