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As I noted in my answer to that question, plasticene or stress balls work. Also, you can use guitarist's finger exercisers I do like your idea of using less fingers for carrying bags etc.
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#1: Attribution notice removed
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System
·
2020-05-27T11:08:37Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/1073 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/