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Crunches on the floor is one of the most effective exercises for strengthening the abdominal muscles. Research suggests that twisting is one of the best abs exercises.
The key working muscle in the classical variation is the rectus abdominis, the most prominent of all the muscles of the press and responsible for the formation of cubes.
Variations of the exercise (for example, side or reverse twists) allow you to engage the oblique and transverse abdominal muscles, as well as aim to swing the lower part of the press. In addition, twisting can be performed using additional weights or even on blocks — this significantly increases the load and has a positive effect on muscle growth and strengthening of the body.