Once you know the BPM you should be running to, you can find the right music and create the ultimate playlist to help you maintain a steady rhythm for your runs. You could also switch up the BPM playlists if you want a more intense run (166 BPM, for example) or an easier jog (150 BPM).
In physiology and medicine, the body surface area (BSA) is the measured or calculated surface area of a human body. For many clinical purposes BSA is a better indicator of metabolic mass than body weight because it is less affected by abnormal adipose mass.
Average BSA for child (12-13 years): 1.33 mÂ² Source: Wikipedia.org (2007). Body surface area. Retrieved from http://en.wikipedia.org/wiki/Body_surface_area 2) Surface-to-Weight Ratio Surface/weight ratio=body surface area (m 2)/body weight (kg).