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Boxers and their coaches don't worry too much about skin-fold measurement. They go by what they can see, and these are the body shapes they look for.
But this guy beat Anthony Joshua
We calculate the weight of fat by multiplying total weight by the 'body fat percentage'. For example, if an athlete weighs 90kg and has 20% body fat (18kg of fat) then his lean weight is 72kg.
These days trainers and clubs don't talk about 'percentage body fat'. They measure skin thickness at four places (triceps, suprailiac crest, para-umbilical, and anterior thigh) and add these measurements (each in mm) to give a 'sum of skinfolds'.
The body fat percentage in male athletes aged 15-19 is about one-fifth of the sum of these four skinfolds. So, if your sum of four skinfolds is 80mm, you have around 16% body-fat. This is OK.
measuring four skinfolds
This is surprisingly easy to do, but you can't measure your own triceps skinfold (you can't reach the spot). However, if you have someone who can do this for you, then measure you own 'sum of skinfolds' but not more often than once a month. You need three or four measurements over three or four months to detect a trend.
The key is to get consistent measurements. The first few times you try, do the sum of skinfolds two or three times in the one day. Do you get the same result? Almost certainly not. The difference should give you a fair idea of the error in doing this. If it is only 5-10 mm, that's pretty good. If it is more than 20mm your measurer needs more practice!!
When you have your sum of skinfolds measured officially, write the result down. Have your measurer do your sum of skinfolds again as soon as possible. What is the difference between your measurement and the 'official' one? Do this again the next time. If the 'official' result is sometimes more, sometimes less, than your one, believe yours. If the difference is small but consistent, then there is nothing to worry about. That's just different people doing the measuring.
The four sites are (it is conventional to measure skinfolds on the right hand side of the body with the athlete standing relaxed, arms at his/her sides, palms facing front.)
If the 'official' tester doesn't use these four sites, then you can't use those results.
You will need a set of skin-fold calipers to do this at home. They shouldn't cost more than twenty dollars.