Which of the following is not a variable on a standard health history questionnaire?

The correct choice is sexual preference, which typically is not included in a standard health history questionnaire. Health history questionnaires are designed to gather essential information relevant to an individual's medical background and fitness capabilities. The primary focus is on aspects that directly impact health, safety, and the ability to engage in physical activity.

Medical history is crucial as it provides insight into previous or existing health conditions that may influence exercise recommendations. Exercise frequency is also important as it helps assess a person's current level of physical activity, which informs program design. Height and weight are basic measurements often included to evaluate fitness levels, body composition, and health risks.

While sexual orientation and preferences may be relevant in specific health contexts, they are generally not deemed necessary for determining fitness programs or assessing an individual's health status in the context of a fitness assessment.