Apple Shortcuts or similar can handle this efficiently. Can even pump it straight into other apps like Apple Health to visualize a variety of metrics that you w

Apple Shortcuts or similar can handle this efficiently. Can even pump it straight into other apps like Apple Health to visualize a variety of metrics that you want to log. Multiple apps too, one tap can enter a metric into Health, log it into another app, and then into a text file. Takes a bit of upfront work to personalize it, but it's mostly just tedious not actually strenuous.