Is it true that clients should always be in thoracic extension when jumping supine on the jumpboard?

The statement that clients should always be in thoracic extension when jumping supine on the jumpboard is false. While some level of thoracic extension can be beneficial during certain movements, it's not a mandatory position for all clients when performing this exercise.

Jumping supine on the jumpboard requires proper spinal alignment and controlled movement, which may vary depending on individual abilities and body mechanics. For some clients, maintaining thoracic extension may cause discomfort or compromise their form, thus increasing the risk of injury. It is crucial for instructors to assess each client's condition and to modify the exercise to promote safety and effectiveness. This means that maintaining thoracic extension is not a strict requirement, making the answer that it is false an appropriate choice.