the 60-minute suggestion is based on the national academy of science's recommendation for people who are trying to prevent weight gain or keep themselves from regaining after weight loss -- not for people who are trying to increase or maintain their cardio-respiratory fitness or health. there's plenty of research to show that 30 minutes of physical activity a day will help you gain lots of health and fitness benefits. remember that you don't have to do all your exercise in one session. if you already exercise vigorously at the gym several times a week there's no reason to quit. but if 60 minutes seems like too much for you try 30 minutes a day as a starting goal. the most important thing is that you do something.
what if i don’t have time to exercise 60 minutes a day?