Any recommendations to keep gains while working outside?

I work a day camp as a 1 on 1 aide for a special needs kid. So I walk outside for about 3 miles and sometimes need to restrain him in 88-95 degree weather. My arms have gotten smaller than they were and im not hitting the same reps. Any nutrition advice to continue to get strong?

- 5'6'' 163lbs. 26 years old male.

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