In this men's C-2 1000m canoe race at Tokyo (2020/2021) Olympics (video provided by NBC Sports), it shows that near 10 meters away from the finish line, it seems that China still leads marginally, while the Cuba team is slightly behind.
Then Cuba catches up and surpasses China.
About 5 meters away from the finish line, both teams stop rowing fiercely and they just wait to cross the finish line. What is the reason for that? Is there a rule? Or is that based on some physics or physical principles?
(at 181 secs of the video)