With the wide availability of inexpensive pedometers, medical professionals recommend walking as an exercise for cardiac health and/or weight loss. NIH gives the following guidelines:  The situation becomes slightly more complex when preferred walking speed is introduced. The faster the pace, the more calories burned if weight loss is a goal. Maximum heart rate for exercise (220 minus age), when compared to charts of "fat burning goals" support many of the references that give the average of , as within this target range. Pedometers average 100 steps a minute in this range (depending on individual stride), or one and a half to two hours to reach a daily total of 10,000 or more steps (100 minutes at 100 steps per minute would be 10,000 steps). The typical walking speed of is recommended by design guides including the Design Manual for Roads and Bridges. Transport for London recommend in the PTAL methodology.