Q: Should you exercise the day after your previous workout if your muscles are still sore? One day I exercise, Next day, Is bad to exercise next day?

A: You should not work out sore muscles, but you can still work out other muscle groups that are not sore. For example, if you had a leg workout and your legs are sore, you can still have a chest workout since it doesn't involve your legs in any way. 'Split' routines are good for situations like this since they stagger different muscle groups throughout the week. You can find some split routines in my Weight Training article.