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A study found that gym members who log their workouts are fitter than those who don't, leading a trainer to claim that logging improves fitness. Which most weakens this?
AFitness is desirable
BLogging takes only a few seconds
CMany members own fitness trackers
DPeople who are already fit and disciplined are more likely to log their workouts
Answer & Solution
Correct answer: D. People who are already fit and disciplined are more likely to log their workouts
Reverse causation: already-fit, disciplined people self-select into logging, so logging needn't cause fitness.
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