SETUP: Secure your feet to a decline bench and lay back. Hands should be placed either in an “X” across your chest or lightly touching the side of your head. Don’t wrap your fingers behind your head, this encourages people to yank their neck, which is bad news. Place a bar (empty barbell, lat pulldown bar, even a broomstick!) across your shoulders and sit up straight. Now allow your torso to move back until you’re slightly above a 45* angle.
REP: Allow your torso to sit back until you reach an angle of 45-60*. Hold this position. You will already feel your abs switch on. Twist from side to side, breathing out every time you complete a turn.
TIP: If you feel the top of your thighs burning, it’s your hip flexors. They are in very close proximity to the muscles we are trying to work, so the moment your abs grow tired (or if they’re weak to start with) they’ll try to help.