Here is a Cultural Literacy worksheet on the idiom “hit below the belt.” This is a half-page worksheet with a two-sentence reading (the first of one is a mildly unwieldy compound which might require revision for some readers) and three comprehension questions.
As you know, this idiom denotes issues of fair play. It arrives in the vernacular from boxing, in which hitting below the belt is illegal. This worksheet might be useful with other materials on boxing available on this blog. Since boxing, in my experience, tends to be of high interest, especially to boys and young men, I have tagged this post as such.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.