What is the ruling for a person who works at a physically demanding job, such as construction, which can result in extreme exhaustion and dehydration?

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They should try their best to leave this type of work or to take a leave from it during the month of Ramadan.
If they are unable to do that, then they should start each day with the intention of fasting until they are no longer able to. At that point, they can break the fast and make up the missed days later, before the start of the next Ramadan.