I’m guessing that you’re referring to a Plymouth Rock, Barred Rock, Amrock, etc.?…Was really hoping to keep at least one of the two rock boys but they both have quite narrow set legs and are somewhat knock-kneed. Not ideal for birds that are already chunky at almost 16 weeks old and only going to get heavier - A already looks like he's struggling slightly at times, and spends more time sitting than I'd like - and definitely not a trait I want to pass on future generations….
If so, I understand why you’re concerned about the legs.
My breeder-(non)quality Barred Rock has very wide-set legs, even though she’s hatchery-quality. She’s not a chonk (yet), but she’s definitely from a dual-purpose lineage, and her skeleton needs to be able to handle either scenario.