https://www.medicalnewstoday.com/articles/254100.php

"A simple test that assesses a person's ability to sit and rise from the floor has proven to be a very accurate predictor of mortality risk. The finding comes from a study, published in the European Journal of Cardiovascular Prevention, by a group of researchers in Brazil.

A total of 2002 adults aged 51 to 80 participated in the study. The researchers timed how long it took them to sit up and then rise from the floor without any help. The median follow-up period was 6.3 years from the baseline test."

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