Rich Froning
Froning and Thorisdottir won the 2012 men's and women's titles.

Welcome to SportsNation! On Tuesday, we're bringing two people to the chat that lay claim to the title of "Fittest on Earth": CrossFit Games champions Rich Froning and Annie Thorisdottir. The 2012 CrossFit Games air on ESPN2 starting Tuesday.

Froning, @richfroning, and Thorisdottir, @icelandannie, both earned their back-to-back titles back in July at the Marine Corps' Camp Pendleton.

The CrossFit Games include high-intensity fitness competitions for both men and women. The workouts - announced immediately before they commence - are designed to test a competitor's strength, speed, agility and endurance through a combination of workouts.

Send your questions now and join the chat Tuesday at 2 p.m. ET!

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