Bear Grylls: I love wearing a kilt with bare feet and no top, like Mel Gibson in Braveheart
The British TV adventurer on the value of being at home, his worst personal habit and chilling out with Barack Obama ...
Look no further — you can build strength and muscle in your core without sit-ups, and here's the move to try
Focus on learning to engage your core at all times, slightly tucking your pelvis toward your spine to avoid arching your lower back. Drive through your hands and shoulders as you draw your feet inward ...