Great exercise for strengthening the core.
Näin teet sen
Lie on your back, feet flat on the floor and knees bent.
Hold a dumbbell in both hands with straight elbows above your chest. Roll your shoulders off the ground, pushing the weight upwards, while keeping the same elbow angle, engage the core during the movement.
When you have reached the top of the movement, lower the weight back down to the starting position.