Is 30 minutes of walking a day enough ?

Varies: It varies somewhat based upon what your goals are, what your other activities you do doing during the day, your dietary intake, and also how "rigorous" your walking is. To successfully lose weight, for example, your calorie expenditure must be more than your calorie intake. Walking 30 minutes a day can increase your calorie expenditure.

Good start.: Walking for 30 minutes daily is a great way to start a cardiovascular fitness program. Eventually, though, you may find that this routine becomes too easy and not challenging enough. You may need to intensify it down the road, either by walking for longer periods of time or by stepping up the intensity to cycling or jogging.