Great fun I'm sure. And I imagine it would be good early warning of any recurring issues!

I'm not sure from the article if the inability to balance is predictive of falls (so we should all be practising balance), or more indicative of general poor muscle tone, or a side-effect of other serious but perhaps yet unknown illnesses. Likely all 3!

Other fun ones
1. Grip strength - https://www.eehealth.org/blog/2020/02/what-your-grip-strength-says-about-your-overall-health

2. Sit Stand test - https://www.prevention.com/fitness/fitness-tips/a20440531/the-stand-sit-test-that-predicts-longevity/

(At 51, I still ace 2. As does my 75yr old ex-dancer mother. My grip is shitty though past year, due to elbow tendonitis)