The goal of this clinical trial is to learn about the effects who would add mental practice based on action observation to a therapeutic exercise program in young mild smokers.

The main question it aims to answer is whether the observation of actions prior to the implementation of a therapeutic exercise session improves the response to it on respiratory, strength and muscle function variables.

Participants will be assigned to one of 2 study groups:

G1) Therapeutic exercise plus action observation training (n=20) G2) Therapeutic exercise plus sham action observation training (n=20)

Inclusion Criteria:

• >18 years old
• Had a pack per year index of <5 (mild smoking index).

Exclusion Criteria:

Those who presented:

• a respiratory pathology,
• cardiac, systematic, or metabolic disease,
• history of recent surgery,
• vertebral fracture,
• or osteoarticular disorders of the spine area.

Participants will be assigned to one of two study groups by the person conducting the intervention.

All participants receive mental practice (real or sham) and the exercise program.

The evaluators are unaware of the assignment at all times.