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A goniometer is an instrument used in physiotherapy to make evaluations of the flexion of the joints of the body, measuring the angles. There are of different types, sizes and materials. How to use a goniometer in physical therapy

The Durnin-Womersley formula is an equation to calculate body fat percentage, is ideal for the general population (ages 17-72), utilizes 4 skinfold sites, and considers gender. 

The Jackson and Pollock 3 formula is used for calculating the percentage of body fat taking the test of 3 skinfold sites considering gender and age.  Is fairly accurate for the general population