Question

how might being too strong actually restrict a joints range of motion?

Explanation:

When muscles are overly - strong, they can become tight and less elastic. This tightness can limit the movement of the joint they cross. Also, bulky muscles may physically impede the joint's range of motion by getting in the way of normal movement paths.

Answer:

Over - strong muscles can be tight and less elastic, and bulky muscles may physically impede movement, thus restricting a joint's range of motion.