Final answer:
Skin fold thickness measurements are best for assessing individuals who want to determine their body fatness. A 36-year-old athlete would benefit the most from these measurements.
Step-by-step explanation:
Skin fold thickness measurements are best for assessing individuals who want to determine their body fatness. This method involves using a caliper to measure the thickness of skin on various parts of the body and comparing it to standards. It is a noninvasive and fairly accurate way to measure fat mass.
In the given options, a 36-year-old athlete would benefit the most from skin fold thickness measurements as it would help assess their body fatness and provide insight into their fitness level.