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From Fellrnr.com, Running tips
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To use the scales you simply step on them holding the handset with your arms at 90°. After a few seconds these scales will display your weight, body fat and other metrics.
[[File:Omron HBF-510 correct posture.jpg|none|thumb|200px|The correct posture.]]
It's important to get the posture just right, as even small variations in arm position [[Arm Position]] make a significant change to the reading.
[[File:Omron HBF-510 posture errors.jpg|none|thumb|400px|Posture errors.]]
=Accuracy issues=
Hydration can have a significant impact on the reading, so readings need to be taken at the same time of day with the same level of hydration. The [[Book Review - The 4 Hour Body|4 Hour Body]] recommend drinking 1.5 liters (3 pints) of water, waiting 30 minutes, urinating and then taking a measurement. I have found that with the whole body scales I can simply measure when I wake in the morning and get a consistent enough reading to not require this hydration procedure. The biggest problem for an athlete is that BIA is particularly inaccurate when fat free mass, including glycogen[[Glycogen]], changes<ref name="BIA1"/><ref name="BIA2"/>. I've noticed that the day after a long run, the scales claim a much larger loss of body fat than is reasonable. Studies have shown that obesity is underestimated with many body fat scales.
=Details=
