How do you use flexion in a sentence?

Here are a few example sentences using the word "flexion":

- The doctor tested the flexion of the patient's knee to see if the injury had healed.

- The yoga instructor led the class through a series of flexion and extension exercises.

- The ballerina performed a graceful flexion of her foot as she rose on pointe.

- The gymnast demonstrated their agility by doing a back flexion.

- The fashion designer incorporated flexion into the design of the garment to provide breathability.