Published on in Vol 12 (2023)
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/43418, first published
.
![Testing Behavior Change Techniques to Increase Physical Activity in Middle-Aged and Older Adults: Protocol for a Randomized Personalized Trial Series Testing Behavior Change Techniques to Increase Physical Activity in Middle-Aged and Older Adults: Protocol for a Randomized Personalized Trial Series](https://asset.jmir.pub/assets/c30f4bcd6e8487fcf48f33f455bbe41b.png 480w,https://asset.jmir.pub/assets/c30f4bcd6e8487fcf48f33f455bbe41b.png 960w,https://asset.jmir.pub/assets/c30f4bcd6e8487fcf48f33f455bbe41b.png 1920w,https://asset.jmir.pub/assets/c30f4bcd6e8487fcf48f33f455bbe41b.png 2500w)
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