National athletes should at least bench 1.5 times of their body weight.
For example, if you weigh 70kg, you should be doing bench 42.5kg per side (taking into consideration the olympic bar weighs 20kg), which adds up to a total of 105kg.
I believe this culture of benching 1.5 times of the national rowers body weight has been implemented. On several occasions of my visit to the gym, I have seen those guys from the national team benching real heavy weights.