Which of the following is NOT commonly used in personal training settings for body composition assessment?

Hydrostatic weighing is typically not commonly used in personal training settings for body composition assessment due to several practical limitations. While it is considered a gold standard for measuring body density and can provide accurate body fat percentages, it requires specialized equipment and facilities, making it less accessible for most personal trainers and their clients.

In contrast, skinfold assessments, circumference measurements, and bioelectrical impedance are more frequently employed in personal training environments. These methods are generally more convenient, quicker to perform, and can be done in a variety of settings without the need for advanced technology. As a result, personal trainers tend to favor these more practical approaches for assessing body composition in their clients.