Final answer:
Bicep curls and tricep extensions employ reciprocal inhibition in a training set aimed at improving strength and flexibility.
Step-by-step explanation:
Reciprocal inhibition is a phenomenon in which one muscle is activated while its antagonist muscle is inhibited, allowing for smooth and coordinated movements. In the context of a training set aimed at improving strength and flexibility, the pair of movements that employ reciprocal inhibition is Bicep curls and tricep extensions. When you perform a bicep curl, the biceps muscle contracts while the triceps muscle relaxes. Conversely, when you perform a tricep extension, the triceps muscle contracts while the biceps muscle relaxes. This alternating contraction and relaxation of the muscles allows for effective training and improvement in both strength and flexibility.