Simply because it gives time for the muscles to recuperate and for broken muscle fibres (they are broken down during when doing resistance training) to repair. Its this repair process that increases our BMR (Basal Metabolic Rate) and makes the muscles stronger and bigger (over time).
Obviously by rest I do not mean sleeping or becoming a couch potato. It simply means a day without your regular workout. For those who have specific fitness goals it can mean exercising a different group of muscles with a different workout or activity. There should be an interval of about six to eight hours between exercise sessions.Obviously I refer to those who exercise to stay fit not high performance athletes or those with specific health goals.
Besides rest as I have described above, one needs to get adequate sleep at night. It is the best healer for our body and mind. Overexercising can cause many problems and in this case more is not always better.
So go ahead and take a break once a week in your workout. You’ve earned it.
suggestions are general in nature. Readers are advised to exercise
caution before implementing them and seek expert advise about what is
suitable for their specific needs.