There was a study in 2015 that found grip strength was a better indicator of longevity than blood pressure. Pretty amazing.
You don't need a gym, you don't even need weights, just find something that will support your weight and start doing free hangs for as long as you can. Eventually move your way up to chin ups. Then you start adding weight lifting to the mix. This will increase your grip strength. Free hangs, active hangs, pushups, chin-ups, and other body weight exercises are an excellent start.
A number of studies have come out recently showing that grip strength is a dependable predictor of overall health
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Grip strength is associated with a range of health outcomes, from type 2 diabetes to depression. Here’s how to check yours.
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We studied prospectively the midlife handgrip strength, living habits, and parents' longevity as predictors of length of life up to becoming a centenarian. The participants were 2,239 men from the Honolulu Heart Program/Honolulu-Asia Aging Study who were born before the end of June 1909 and who...
pubmed.ncbi.nlm.nih.gov