LONDON—British intelligence has been intercepting millions of video chats and reports seeing “undesirable nudity” in 7% of them, causing a wave of terrorists to head to the gym to try to make their nudity a little bit more desirable, according to documents leaked here today.

“Oh, my God. I am so embarrassed,” said Kelsey Winslow, 26, who makes firebombs for a radical environmental group in Wales. “Sure, I’ve let myself go a bit during my time on the lam, but I didn’t realize it was as bad as that.” Winslow reports having started a rigorous cross-training program and says she “hopes the next leaked report gives us a better grade.”

Experts voiced concerns that the language of the report could lead to a negative body image among thousands of wanted felons, potentially leading to eating disorders. “Fugitives tend to have low self-esteem to begin with,” said Sandy Pearsall, a professor at Sheffield Medical School. “Being called names by the government is just going to make things worse.”

Not all surveillance targets accepted British intelligence’s verdict. “You call this undesirable nudity?” demanded Mohsin al-Ibrahim, 38, a member of a militant splinter faction in east London, sucking in his gut and flexing. “Look at the guns!” he shouted, kissing his own bicep. “Like pythons!”

A spokesman for the British government refused to answer questions, although, departing from his prepared text, he did note that “there are certain angles and lighting from which Mr. al-Ibrahim’s self-assessment is not entirely accurate.”