I have been asked by some people if having a rest day is necessary. The answer is yes it is necessary. The reason why it is necessary to have a rest day is because it help your muscles and body to heal. Without a rest day you are prone to injury and you will also tire yourself out from working out that you may get sick of it. I know for a fact that if I do not have a rest day from working out that I get bored from the same old routine and my muscles are just going through the motions.
According to The Active Times they say you should allow one day a rest before you start working the same muscle groups again. The American College of Sports Medicine recommends that adults get at least 150 minutes of moderate-intensity cardio exercise per week. Another great way to achieve this is to weightlift 30 to 60 minutes 5 times a week or 20 to 60 minutes 3 times a week. Leaving at least 48 hours between workouts.
You should also make sure you drink water during your workout because dehydration can lead to overheating, headaches, and muscle fatigue. So make sure you drink your water. Also remember that letting your body heal at least one day a week before you start working out the same muscle groups is a must. Without a rest day you will be prone to injuries like such as stress fractures, muscle strains, and joint pain.
So make sure you get your rest day in during your workout week. It is the most crucial part about working out in my opinion because it helps your muscles repair after you tear them during your workout. By letting your muscles repair helps you to build muscle. Without repairing your muscle you will not be able to build any muscle at all.