A flat stomach more in a month? This is the promise of the "board challenge".

Launched by Anna Kaiser, New York coach and creator of the AKT InMotion Studio, it aims to strengthen the abdominal strap and refine the silhouette.

In the closet therefore, the "little brioche" and placed in a body sculpted in just 30 days, thanks to this exercise of cladding - to hold more and longer over the days - whose results are no longer to prove.

Attention, this is not a miracle method.

In addition, one adopts a balanced diet, one makes cardio to burn calories and one tones the other parts of the body with targeted exercises.

How to do the board?

Vincent Bertiaux, sports coach at Fitness Park Courbevoie (92), explains how to make a perfect board:

"Stand on the ground, resting on the elbows, placed under the shoulders, the hands should be on the ground and stay in the axis of the elbow.

The feet are positioned width pelvis, the head is in the axis of the column and the gaze turned to the ground. The back is straight, parallel to the ground. Hold the position by contracting the abdominals and glutes.

Be careful not to raise the buttocks too high and if you have pain in the lower back, it means that the pelvis is too low. Your body must really look like a board. "

And if you are a beginner? "Starting from the starting position, knees are placed on the ground which facilitates the exercise, while the confirmed ones can widen the space between the arms and the feet (by pulling them back) to solicit more the abdominal strap ".

So ready?