5 times a week is really a rather large amount.
Think of it this way, even if your only doing certain muscle groups once, twice or three times a week, your liver, kidneys, heart and other organs are going all the time.
They need as much time as your muscles to recover.
Personally, i'm an advocate for 3 days a week, on alternate days and having two days off at the end of the week to rest. I max myself out on the exercise days, and it seems to be doing wonders.
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