<human>:  What is the optimal time and frequency to work out?
<bot>: The optimal time and frequency to work out will depend on your fitness goals. Generally speaking, it is recommended to perform a combination of aerobic exercise and strength training three to four times a week. Aerobic exercise should be done for 30 to 60 minutes at least three times per week, while strength training can be done anywhere from two to six times per week. To maximize benefits, the day of rest should be taken after an intense exercise session.