It's time to target those abs again, so grab a mat and let's go!
How to: Start off in a seated position, with your elbows up and finger tips touching each other. Lean back slightly, maintaining an upright position and abs held in.
Begin to twist your torso to one side and repeat on the other. Too easy? Lift your feet off the floor.
Now you: See how many you can do in 1-minute