Chewing gum, talking on the phone, grunting and taking selfies are just a few examples.
Dwayne Johnson's four-minute YouTube production offers a glimpse of his intensity in the gym.
Florida man posts YouTube video of his fitness exploits.
Uneven loads will build a rock-solid core while also cranking up the heart rate.
Trainer says her fitness regimen is "not for faint of heart."
This movement promotes mobility and coordination in addition to building strength.
Golf icon earned nickname "Mr. Fitness" back in the 50s, and he's still proving it.
Santa Fe, Boulder and Jackson, Wyoming, are among the picks.
Cubs slugger talks rehab and celebrating the World Series in Chicago.
Snorkel in clear waters of Thailand or mountain bike on most dangerous road in the world.