Introducing the j20 workout. A j20 workout is simply any activity that you can devote 20 minutes to. Anything, JUST think each day, what can I do today for a workout or a form of exercise? According to physical education guidelines, the recommended amount of exercise for a person is 150 minutes a week. Using the j20 concept (JUST 20 minutes) of doing some fun activity, you will easily reach the 150 weekly minutes because you some days you will exceed the 20 minutes since you are having so much fun. There are 24 hours in a day, you owe yourself JUST 20 minutes. So get out there and start doing a j20 workout – swimming, walking, running, gym time, rollerblading or playing basketball.