Which set below contains an exercise that cannot be performed on both the Reformer and Chair?

The Teaser and Airplane are both advanced Pilates exercises that have specific requirements, particularly in terms of equipment and body mechanics. The Teaser is primarily performed on a mat or Reformer, where it requires the use of the springs to assist in stabilizing the core while lifting the legs and torso simultaneously. On the Reformer, the springs provide a level of resistance that aids in achieving proper form. However, the Airplane exercise is specifically designed for the Reformer and is not performed on the Chair, as it primarily involves the use of the Reformer’s straps and carriage to achieve the desired movement while maintaining balance and control.

The other sets mentioned, such as the Roll Over and Pushups or Mermaid and Swan, can be adapted to both the Reformer and the Chair with slight modifications. This differentiation in exercise adaptability helps clarify why the Teaser and Airplane stand out as a pair that cannot be performed interchangeably across both apparatuses.