1 sentence in portuguese

hi guys
can anyone tell me what this sentence means?
Eu nao conheco ele muito bem.
Mas, dizem que ele faz tres series de cinquenta.
context: conversation at the gym.
thx
Answer #1
first part is here:
I do not know him very well.
Second part not as accurate but here it is:
But say it does three sets of fifty.
Answer #2
no google translate, please
Answer #3
I do not know him very well. But, we are told that he makes three series of fifty.
Answer #4
I do not know him very well. But, we are told that he makes three series of fifty.
In the gym context, would it mean that he lifts 50 kg and he can do it three times?
Answer #5
Yes probably bench press or sth.
Edit: Not three times, three sets. 3*10 or 3*15.
Answer #6
I don’t know him very well, but they say he can do 3 sets of 50