The Importance of Rest for Muscles
Legs are next on the list, meaning that you can go walking, running, biking, etc. every other day safely. It starts to get tricky when you get to the arms, chest, and back. Play it safe and work each of those muscle groups just once a week, and you'll be sure to be giving those muscles plenty of recovery time.
Muscle rest is essential to your safety while working out, as well as your health in general; make sure not to ignore it, and you will see the results you are looking for while feeling your best.