The former Chelsea stopper, 36, appears to have added a massive amount of muscle mass to his upper-body this summer.
Cech has been tipped for a move back to the Blues after Bernd Leno's arrival at the Gunners.
Now fans on Twitter have had their say – and come up with some incredible reasons for Cech's late-career transformation.
One social media user reckons Cech is going to fight Leno for the No1 jersey – while another claimed he must have been living in a gym.
Here's the best of the Twitter reaction…
Despite rumours suggesting Cech could make an emotional return to Stamford Bride, his agent confirmed he is focused on Arsenal.
Speaking to ESPN FC, Viktor Kolar said: "It is always busy during every transfer window around Petr Cech, as a great Premier League person.
"However, he maximally focuses on the new season at Arsenal, no specific offer is available."
Cech was Arsenal's first-choice goalkeeper last season under the management of Arsene Wenger… and at the very least appears to be more weights-focused under new boss Unai Emery.
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