Planks are a quintessential bodyweight exercise ... Lie on your right side. Prop yourself up on your forearm, with your elbow right below your shoulder. Extend your legs, and stack your left ...

For a rugby player, he says, practicing the plank will offer core strength for a scrum, skeletal stability when in contact, and it’ll help them get up from the floor, 'especially later in a game ...

What is clear, however, is that the plank became the favored core exercise a decade or so ago, eclipsing the crunch and sit-up. The latter two exercises can put strain on your spine and hip ...