No one argues exercise is good for you, but how often should you exercise? Used interchangeably exercising is training your body to be fit and function optimally.  Exercise Science - Starting Simple

How much exercise depends on a lot of different factors – such as what is your goal(s), are you training for an event, how intense will you exercise, and do you have any history of injury you may have. Why and what you are training for helps determine how often you need to exercise.

Common sense dictates if you want to be and stay ‘fit’ you must exercise regularly. You can not exercise non-stop, a period of recovery is critical. Recovery time is dependent on many variables, including age and what body system you are training. The nervous system is stressed with certain activities; sprinting, heavy resistance training, and high-intensity interval training. High-intensity exercise needs a longer recovery time than lower-intensity activities such as jogging that stresses the heart and lungs. The heart and lungs will recover faster than the nervous system.

It’s recommended that muscle-strengthening exercises be done two or more days per week to improve muscle and bone health, alternating different muscle groups in sessions.

Another important finding is that multiple days a week of resistance training is good but even one day a week improves your strength. Another impact to developing overall strength is correctly performing squats and lungs.

The concept of ‘lifting to failure’ offers no added benefits for improving your strengtheners.

Do you just want to stay in shape? It’s not how much you do, it’s the quality of what you do. You’ve heard of high-intensity interval training (HIIT) it is being touted for improving fitness and health. The concept is to exert your max effort for a short time and then followed by resting. Studies recently show that 4 to 7 bouts of intense one-minute exercise followed with 75 seconds of rest, done 3 times a week will improve fitness and mental well-being. We all need plenty of good mental health in this pandemic. This approach could be very beneficial for people who don’t regularly exercise. You’re then basically doing about 30 minutes a week and that is beneficial.

The key is to train consistently in a manner that has repetition and recovery in balance.