Final answer:
While performing a handstand, the upper arm experiences compressive loading.
Step-by-step explanation:
While performing a handstand, the upper arm experiences compressive loading. This means that the force is pushing inward and compressing the arm.
When the upper limbs are extended out at a ninety-degree angle from the torso, it creates a situation where the weight of the body is directed downward and compressing the upper arm. Therefore, compressive loading is the correct answer.