Dang - those are some serious guitar skills.

Rascal Flatts stripped down - music-wise, people - and busted out an acoustic version of "Life Is A Highway" backstage at The Tonight Show Starring Jimmy Fallon.

In case you're not from this planet and haven't heard it before...the song was originally a hit back in 1991 from Tom Cochrane.  Rascal Flatt's version debuted in 2006 and was featured in Disney/Pixar's Cars.

Want more of these guys? Listen to Rascal Flatts Radio on iHeartRadio here.