Planking..

Plank

(works your abs, back, butt, hips, thighs and shoulders)

• Get into a raised push-up position,
• with forearms resting on floor,
• palms down,
• abs pulled in tight.
• Keep body in a straight line from shoulders to heels, as shown.
• Hold for 20 to 30 seconds.

Seriously burns. Initially you might not be able to plank for even 10seconds, but don’t give up. Keep practicing, each time, you’ll find yourself able to last longer and longer.