Predict first, then read

What happened at 24 Hour Fitness (megastudy)?

Make your call before you read the case. Then see the dated outcome, its source, its grades and the psychology behind it.

24 Hour Fitness (megastudy)

Round 1 of 1Make your first call

24 Hour Fitness (megastudy)Return

Real case

Scientists tested 54 different programs (rewards, reminders, plans) on 61,293 gym members for four weeks. About 45% of the programs raised gym visits while they ran. How many still showed an effect after they ended?

About 45%: the habits stuckAbout 25%About 15%About 8%

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