Yes, you can always amend and add business expenses, if you have any. Expenses that are ordinary and necessary for that type of business are deductible. The gym membership might be deductible.
Paying rent and buying food are normal expenses. Travel expenses are a different story. It doesn't sound like he was not traveling though, just went to one spot to work.
You know more about what he did, see Deducting Expenses.
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