Tester takes subject's height, weight, and residual lung capacity.
Subject holds as still as possible.
Tester hits on side of tank to signal subject weight has been taken. Inaccurate with power athletes with high bone density. Football players have been measured with negative percent body fat. Possibly inaccurate with individuals with low bone density. Flexibility Testing A goniometer or unilever inclinometer measures angles and range of motion of joints.