What is the purpose of having your client squeeze a ball between his elbows during an exercise such as the lateral step or monster walk?/2022

What is the purpose of having your client squeeze a ball between his elbows during an exercise such as the lateral step or monster walk?

1. PROMOTE THORACIC FLEXION
2. INCREASE ACTIVATION OF THE UPPER TRAPEZIUS MUSCLES
3. PROMOTE TRUNK STABILITY
4. PROMOTE LUMBAR FLEXION