Jeff Kyle is honoring his brother, "American Sniper" Chris Kyle, by raising money for a charity that benefits wounded veterans.

Kyle, a former Marine, appeared on "Fox and Friends" this morning to explain BeastMode for the Brave.

"BeastMode can be anything from what you see here, working out, to, if you're a bull rider, getting on as many bulls as you can and riding as long as you can, skydiving, drawing a crazy picture. Something that just challenges you, that you wouldn't do on a normal basis," Kyle said.

Here's how it works: You film your challenge, whatever it may be, and post it to social media, challenging some of your friends by name. If they don't show you up within 24 hours, they're asked to donate $100 to BeastMode for the Brave, which benefits Chris Kyle’s Guardian for Heroes Foundation and Silent Warrior Scholarship Fund.

This morning, Kyle challenged Steve Doocy, Elisabeth Hasselbeck and Clayton Morris to five kettlebell swings, three box jumps and five push-ups.

Watch the "Fox and Friends" hosts take the BeastMode challenge in the clip above and hear more from Kyle below.