press arch and chalk

Hey there,
I have 2 questions if thats okay.
first, how much arch on the press is harmfull?
Second, i recently started rock climbing in an indor gym which made me think, is inhaling chalk bad for you?
Thank you very much in advance!

There is no single “amount” of arch that can be deemed “harmful” for all people.

Inhaling significant amounts of chalk or inhaling chalk over several decades can cause certain lung issues, like silicosis, for example. I have no idea whether the level of exposure you’re experiencing poses any significant risk … but I doubt it.

thank you for responding!
How do i know how much is to much for me in both of these cases?