Grip strength is an established measure of health and has previously been linked to one's ability to cope independently and predicts the risk of cardiovascular diseases and mortality.

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The Zona Plus Principle and the $30 Alternative- Camry digital hand dynamometer

1. Squeeze 1/3 of your max grip for 2 minutes for each hand with one minute of rest between.
2. 3 repetitions = 12 minutes total.
3. Do this 3 to 5 days a week.
4. Positive results should show in 4 to 8 weeks.

Review paper:

https://www.ncbi.nlm.nih.gov/pubmed/24582191

https://www.ncbi.nlm.nih.gov/pubmed/24174307