The ideal exercise regiment is a function of your physiognomy and physiological status; which are moderated by age, work ethics, nutrition, weather etc!
Therefore, what is ideal for me might be otherwise for others!!
So, you ought to get your general health status right as certified by a qualified physician who would prescribe the ideal type, frequency and duration of exercise which will pep you up for maximum performance.
But because the essence of exercise is to keep fit ; you could decide to be active as moderately as possible by deliberately engaging in physical activities, like jogging, walking, riding ; sometimes just aerobics , involving movements of the body parts, especially the limbs , repeatedly at home!
Do this as often as your health status permits., thus your weekly exercise might not be enough for a healthy but a sedentary worker!
Are you sedentary?? Engage in exercie more often!!
Of course, not. You should do it systematically and on a regular basis, at an interval of 1-2 days