An Adelaide Hills man has been fiend more than $6000 after he was found exercising at a gym instead of isolating.

Police have said the man, 25, from Woodside, returned home from New South Wales on July 20 and was told to self-isolate for two weeks.

However, he is thought to have visited his local gym six times.

After investigating, SA police fined the man six times, ringing the total amount to $6360.

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