How many days of rest are good?

Currently I'm working out 6 days a week, with one day rest.

Today, however, I've been incredibly busy... I did walk in the snow instead of taking the bus, though. I looked crazy, waddling about and getting snowed in in my own coat.



So I was thinking, how many days of rest are good, in one week? 3? Before I used to work out one day, rest the next. But this was when I only did cardio.



Now I work out different parts of my body each day. My workout routine goes like this:



Mon. Cardio

Tue. Lower body

Wed. Upper body

Thurs. Martial arts

Fri. Lower body

Sat. Upper body

Sun. Cardio



And I take rest days depending on when I don't have time and when I do. Do I really need a days rest between each workout?



Thanks :)

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