Can you hold a plank longer than others your age? Fox hosts test their core strength

Can you hold a plank longer than others your age? Fox hosts test their core strength

Brian Kilmeade and Lawrence Jones compete in friendly on-air fitness challenge

"Fox & Friends" co-hosts Brian Kilmeade and Lawrence Jones competed in a plank challenge on-air Thursday morning. (Fox News)

A fitness expert at Lifetime in New York City provided targets for how long you should be able to hold a plank by age. (Fox News)

In addition to working the abdominals, planks also strengthen the muscles in the arms, legs, chest and back. (Fox News)