I’m absolutely champing at the bit to get back to it…

Huh… I was going to deride the newsletter for such an obvious grammatical error, but evidently Champing at the bit is the original expression!

https://grammarist.com/usage/champing-chomping-at-the-bit/

Champing stems from an old Middle English word that has been around for at least 600 years and relates to the grinding of a horse’s teeth.

Someone at CIG knows their historical linguistics.