@MrRower17 whether the power distributed unevenly or not, there is no way the boat is flexing to the degree it appears. You couldn't flex it that much on land with 3 people trying
Ideals conditions, and assume that all rowers are identicals, is why science is a method and not an aproach to the truth, and by that I mean, progress how ever not a necessary improvement.
The boat itself at 1:02 doesn't bend, but the rowers in the middle create an optical illusion with how they move their bodies to our left. If you look carefully at the hull, it doesn't bend.