Modern healthcare recommends 30 minutes a day of exercise. I suggest people do whatever activity they are comfortable with to improve their health status and delay the effects of modern lifestyle and reduce the risks of catastrophic diseases.
I have carefully selected five exercises that are done daily for 300 seconds = 5 minutes. These five exercises aim to build up upper body strength to reactivate atrophied muscles since active muscles burn 10 times the calories compared to fat cells. Over time with an investment of less than 1% of your daily minutes you will carefully sculpt a stronger body more resistant to injury or illness. I have written about these five exercises elsewhere.

1. pushups , 2) squats, 3) monkey crawls (crawl around like a baby), 4) crab crawls (sit down and use your hands and feet to shuffle around the floor) and 5) door bar pullups simply by hanging out your body from a solid overhead structure. These always available exercises will ramp up your daily metabolism slightly for 36 to 48 hours; but remember you are repeating them every 24 hours. No travelling to expensive gyms, no excuses would be valid and no getting all hot and sweaty. There is no reason to experience breathlessness nor pain since you never work towards fatigue, slowly your muscles recover and modify themselves to become stronger as your joints, muscles and ligaments all improve with functional strength... Good luck and have fun and maybe even get others in the household involved. Be especially careful with the pullups since remember your trying to move your entire bodyweight; so simply hang from the bar for the first 2 weeks, after all you have the rest of your life to sculpt the new you...