@scopecr33p
The results? TLDR: Taking just raw numbers of gym attendance, they observed a 15.9% increase in gym attendance in the full treatment group when compared to the control, and 15.8% when compared to the intermediate group. This was primarily driven by the treatment group maintaining high attendance over the 9 weeks of the study, where as the control and intermediate group started strong, they lost motivation as the weeks went by.
In addition the full treatment group self reported as finding the gym more enjoyable by one std deviation higher than the control group.
You can find the full study here: https://pmc.ncbi.nlm.nih.gov/articles/PMC8822539/