Ryan Reynolds reveals he once saved his nephew's life

The "Deadpool" star and his wife, Blake Lively, are certified in CPR.

The actor and his wife recently completed a refresher course, and on Monday, they urged their followers to get trained too.

Reynolds also thanked Viva First Aid for the lesson, then joked, "And thank you to these two helpful yet lifeless dolls whose vacant ocular cavities will haunt me until end times."

Lively, 29, posted a photo from Viva and encouraged her fans to take a CPR course.

"ALL MAMAS AND DADDIES OUT THERE-- I can't recommend this enough, I took a CPR class with with a focus on babies and toddlers," she wrote on Instagram. "Google 'infant CPR class near me' and you'll see lots of listings. For those of you who haven't done it, you will love it. It's so helpful by giving you knowledge, tools, and some peace of mind."

Reynolds and Lively have two daughters, James, 2, and 9-month-old Ines.