Prisoners working out inside prison, Brazil [Getty Images]

Prisoners working out inside Adriano Marrey maximum security penitenciary, Guarulhos. Brazil. (Photo by Christopher Pillitz/Getty Images) — see more

Prisoners working out inside Adriano Marrey maximum security penitenciary, Guarulhos. Brazil. (Photo by Christopher Pillitz/Getty Images)

Hulton Archive Christopher Pillitz/UNI UK