What test can a Personal Trainer use to assess a client's flexibility?

The sit-and-reach test is a widely recognized and effective method for assessing flexibility, particularly in the hamstrings and lower back. It involves the client sitting on the floor with legs extended and reaching forward towards their toes to measure how far they can stretch. This test provides a clear and quantitative result, making it useful for personal trainers to evaluate the flexibility of clients over time or in comparison to normative data.

Other tests listed in the options are not designed to measure flexibility. The 1-repetition maximum test focuses on assessing strength and muscular endurance, while the vertical jump test evaluates explosive leg power. Body mass index is a calculation related to body composition rather than flexibility. By using the sit-and-reach test, personal trainers gain valuable insight into a client's flexibility, which can inform training programs and injury prevention strategies.