martes, 7 de diciembre de 2010
SWISS BALL PLANK
A core stability exercise.
Start by resting your knees on the floor and your elbows and forearms on the ball.
Contract your core muscles and lift your knees off the ground, keeping your hips and back in a straight line.
Ensure you keep your shoulders down.
As soon you begin to shake or your hips drop return to your knees.