Final answer:
Performing a squat on an unstable surface can increase squat depth by challenging balance and stability. However, beginners and those with weaker muscles may initially experience a decrease in squat depth as they adjust to the instability.
Step-by-step explanation:
When a client performs a squat on an unstable surface, such as a balance board or a Bosu ball, it can have an increased effect on their squat depth. The unstable surface challenges their balance and stability, which requires the use of more muscles to maintain proper form and control during the movement. As a result, the client may be able to squat deeper than they would on a stable surface.
However, it's also important to note that individual differences and experience levels can affect the impact of an unstable surface on squat depth. Beginners or those with weaker core and stabilizer muscles may initially experience a decrease in squat depth as they adjust to the instability. With regular practice and progression, they can eventually improve their squat depth.
Overall, an unstable surface can increase squat depth by challenging balance and stability, but the impact may vary depending on individual factors.