Final answer:
The most common compensation during the sphinx with reach drill is Excessive Thoracic Extension, where individuals overextend their upper back due to mobility restrictions. Option A is correct.
Step-by-step explanation:
The most common compensation seen during the sphinx with reach drill is A) Excessive Thoracic Extension. This exercise is a movement pattern designed to improve shoulder mobility and upper thoracic extension. However, many individuals compensate by overextending through the thoracic spine due to limited shoulder flexion or other mobility restrictions.
This compensation can lead to suboptimal outcomes and even injury if not addressed. Excessive thoracic extension often indicates that an individual is trying to reach further in the movement by arching their back instead of using the intended shoulder muscles for shoulder flexion and stabilization.
To correct this issue, it's important for the individual to focus on maintaining a stable core and a neutral spine, ensuring that the movement comes primarily from the shoulder joints with proper scapular movement and stabilization. Cueing to engage the abdominal muscles and to limit the arching of the back can help correct this excessive extension.
A focus on fluid and controlled shoulder movements during the drill, potentially with adjustments to the range of motion or support, may also mitigate the excessive thoracic extension.