This depends on what your fitness goals are and your own level of fitness. It has been proven that individuals that are just beginning an exercise program can receive physical and physiological benefits from just 2 to 3 days per week of exercise. However, if you are at a higher level of fitness you may require upwards of 5 days per week for physical and physiological benefits. ACSM recommends for healthy individuals to perform cardiovascular exercise at a moderate intensity for at least 30 minutes per day, 5 days per week, totaling 150 minutes. In addition, you may exercise at vigorous intensity for 20 to 25 minutes per day for 3 days per week, totaling 75 minutes. It is also recommended that you perform at least 2 days per week of resistance training. And don’t forget to check with your primary care physician before you start any exercise program.