the phrase “Get Crackin'” refers to the sound your knees make when you stand up!
Mobility is #1 for any senior. To move often, even in the night in bed somewhat. Mobility/movement is (continuing/continued) life. Our ubiquitous/prevalent sedentary lifestyles mitigate against that. We need to be constantly getting up from our phones, t.v.s, and computers. I have long observed and agreed with the phrase “It is hard to hit a moving target”. Active living is pretty basic to survival. To say nothing of keeping an active mind.