Range of Motion
Range of motion also known as (ROM) means "the are through which a joint may be freely and painlessly moved. A goniometer is used in the medical field to measure a joint's range of motion. It can be helpful in finding out if a patient is lacking in mobility due to an injury. The term "goniometer" comes from two Greek words that mean "angle" and "measure." This is essentially what you are doing when you measure range of motion/measuring an angle. Some activities that you can measure your joints are: 1.Throwing a baseball position 2.Extending arms 3.Putting arm at different angles.
Measuring Instruments
The instruments you need to use for measuring joints are: the goniometer.