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Use "stiffness" in a sentence
"One benefit is the lighter weight; another is an 11-percent boost in stiffness, according to Washburn."
"I have a little rotator cuff stiffness from a fall two weeks ago, when I popped both feet while I was at full arm extension at a funny angle, so I bailed early on the 5.8 (it's a really hard 5.8: another Prime Climb sandbag job) that is my current project wall."
"His hip stiffness is evident when he tries to change direction, as he has trouble sometimes playing off-coverage situations."