Dr. Toran's Take:
This exercise is one of a few that should be considered a staple in the cyclist's arsenal. Thoracic rib mobility and function is critical to breathe efficiently and "expansively."Comfort of the upper back, neck and shoulders hinges on a relaxed and supple ribcage. Performing the basic movement will help increase the available lung volume, helping cyclists to get enough air while pushing on the flats or up hills. The mermaid will improve the stability of the shoulder blade on the ribs as well as increase the available range of motion to the shoulder. A stable shoulder girdle will make those long stretches on the hoods or in the drops feel a little less long.
There are many ways to perform this exercise; leg position variations, arm position variations, trunk starting and ending position, as well as what Pilates apparatus is being used. All however have a lateral bending component. The lateral bending opens the ribs as it stretches the intercostal muscles and fascia. For the cyclist, deep, repetitive and deliberate breaths as the position is held, are vital to achieving the desired benefit.