This is a test of commonsense. Complete the next sentence:

How to use crutches
Obtain new crutches or used ones that are in very good condition.
Make sure the crutches are sturdy, and that the rubber padding, where your armpit rests, is still springy. Inspect the the bolts or pins that adjust the crutch length.
Make sure the crutches have the rubber tips at the bottom. Adjust the crutches to a comfortable height.