The participants abstained from caffeine products and exercise for two hours prior to testing.
In one case they then took 15 minute brisk walks. In another case they sat quietly for 15 minutes.
After each scenario, participants completed a mentally arousing task and were allowed to hold but not eat a chocolate bar.
The results showed that sitting still did nothing to reduce chocolate cravings but a 15 minute walk reduced urges to eat chocolate.
The study is in the journal Appetite.