45% of the 54 exercise interventions significantly increased weekly gym visits by 9% to 27% during the four-week intervention¶

Claim · All claims
Evidence · 1 study · causal r? · q3
Currency · newest study 2021 · checked against its sources 2026-10-20 (automated, 1 of 1 entry) · not reviewed by a person

Subclaims¶

q3 i? In the fitness-chain megastudy, 45% of the 54 four-week digital programmes significantly increased weekly gym visits, with increases of 9% to 27%. → Kautz 2021

Evidence¶

Kautz 2021¶

Kautz, T., Milkman, K. L., Gromet, D., et al. as printed in full author line. (2021). Megastudies Improve the Impact of Applied Behavioural Science. Nature, vol. 600. https://www.mathematica.org/publications/megastudies-improve-the-impact-of-applied-behavioural-science doi:10.1038/s41586-021-04128-4

q3 · i? · causal · r?

Large field experiment (megastudy) with 61,293 fitness-chain members comparing 54 four-week digital exercise programmes on objectively measured gym attendance. The article reports that "45% of these interventions significantly increased weekly gym visits by 9% to 27%"; no standardized effect size is printed.

"We show that 45% of these interventions significantly increased weekly gym visits by 9% to 27%; the top-performing intervention offered microrewards for returning to the gym after a missed workout."

Discussion¶

Learner Variables¶

• Physical Well-Being — outcome: instruction changes it

Related Claims¶

• Forecasts by impartial judges failed to predict which interventions would be most effective — related
• The top-performing exercise intervention offered microrewards for returning to the gym after a missed workout — related
• Only 8% of the exercise interventions induced behaviour change that was significant and measurable after the four-week intervention — related
• Among interventions that increased exercise during the intervention, carry-over effects were proportionally similar to previous research — related