Health specialists are agreed that one need half an hour of moderate exercise for 5 days a week to stay healthy. However, what is moderate exercise (intensity of the exercise) is not stated. Researchers at the San Diego State University led by Simon Marshall did a study on 97 healthy young men published in American Journal of Preventive Medicine gave a rough guide - average of 100 steps per minute of brisk walking.
Actually, to be more specific, they concluded that men needed to walk at a pace of 92 to 102 steps per minute while for women it is 91 to 115 steps per minute to achieve a moderately intense workout for their hearts. According to Simon Marshall, health will benefits with bouts of exercises of 10 minutes, a good starting point will be to walk 100 x 10 = 1000 steps within that 10 minutes and gradually increasing it to 30 minutes, that is 100 x 30 = 3000 steps within 30 minutes.