The best performance tests do which of the following?

The best performance tests are designed primarily to provide useful data. This data is critical for tracking an athlete's progress, assessing their current physical capabilities, and informing training decisions. Useful data allows coaches to tailor their conditioning programs to the specific needs of the athlete, helping to optimize performance and prevent injuries. By gathering accurate and relevant information through performance testing, coaches can make informed adjustments to training regimens.

The other options do not align with the primary purpose of performance testing. Making an athlete feel good may be a positive outcome but should not be the primary focus of a performance test. Similarly, while demonstrating the strength and conditioning coach's expertise may occur as a result of effective testing, it is not the intended goal of the tests. Finally, while some tests might involve high levels of exertion, exhausting the athlete is not a valid objective; the aim is to gather data without compromising the athlete's performance or recovery.