You don’t usually hear about “chest expansion” when Spidey’s powers are mentioned.
Amazing Spider-Man (Vol. 1) #14
Published: c. May, 1964?
Cover Date: July, 1964
“The Grotesque Adventure of the Green Goblin”
Writer: Stan Lee
Artist: Steve Ditko
Inker: Steve Ditko
Letterer: Artie Simek
At this point is was like every other issue Stan would invent some new power Spidey had that the plot demanded.