The plank isometric exercise

Plank

Muscles; abs internal and external

1. lay with your face down on the floor, keep your legs and feet together maintain a neutral spine position. Place hands together and form a V with forearms.

2. Lift your body transferring the weight onto your forearms, and toes, draw stomach in.  Hold position for 30 -40secs beginners, otherwise hold for as long as possible.

for extra resistance  extend arms further out