Bored with planking and crunches to strengthen your core? Try challenge yourself by doing Ys on the floor.

This exercise will work on your upper back and shoulders:

Step One: Lie on the floor on your stomach with your face down and make a Y-shape with your hands by raising them above your head. Make sure your hands are wider than your shoulders.

Step Two: Pull yourself up (or your abs toward your spine) while ensuring that your hands are still making the Y-Shape and then lift them up from the ground.

Step Three: Hold this position for at least three seconds then lower yourself to the starting position. This will count as a single rep.

Step Four: Do three sets of eight reps.

Image: Popsugar.com

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