There might be something on that but don't forget that those were romans (b..). Most professional archers of the tiem were recruited from Hunters (nomads) who technically used a bow all there life. And yes being an archer is tiring, but in my experince most people who really use bows alot don't tire that quickly. Atleast thats my opinion.
I think that was done .. its in this short movie https://www.youtube.com/watch?v=7dDVy8eagJM
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