On the topic of grip strength, "Grip Strength: An Indispensable Biomarker For Older Adults": > Several authors have recommended grip strength as a “useful indi

On the topic of grip strength, "Grip Strength: An Indispensable Biomarker For Older Adults": > Several authors have recommended grip strength as a “useful indicator for overall health,”[16] a vital sign[4,5] and as a biomarker of health status.[3,138,139] The purpose of this literature review was to provide an up-to-date, thorough and balanced synopsis of evidence for using grip strength as a biomarker of current and future health status. Based on the review it appears that there is adequate evidence to support the use of grip strength as an explanatory or predictive biomarker of specific outcomes such as generalized strength and function, bone mineral density, fractures, and falls, nutritional status, disease status and comorbidity load, cognition, depression, and sleep, hospital-related variables, and mortality. Based on this evidence and the promotion by others,[140] the routine implementation of the measurement of grip strength can be recommended for older adults in the community and health-care settings. * https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC6778477/ https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC6778477/ (There are notes on some limitations of the metric.)