sore muscles

I was wondering if anyone knew if when the day after a workout your muscles are sore, is your heart also 'sore'? Its a muscle too so I was just wondering if it needs a rest the day after and cardio should be avoided. Does it need time to rebuild like other muscle after cardio. Is consecutive days too much for it?

Also any tips for reducing soreness? Does soreness mean you've done too much?

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