Foam rolling is important to do before and after a workout. But it can also be beneficial if you don't workout. Kristina Martemucci, general manager at Riverwalk Athletic Club, recommends foam rolling 10 to 15 minutes a day even if you aren't doing physical activity.
Foam rolling helps with blood circulation, it helps stimulate the lymphatic system, which is connected to your immune system and it can stave off infections and it helps warm the body up.
Prior to any type of exercise you should foam roll to get the muscle warm and ready to go into any activity it's about to do.