Which factor is NOT commonly associated with hair growth concerns in clients?

In the context of hair growth concerns, diet, stress, and genetics are widely recognized as significant factors influencing hair health and growth patterns. Diet plays a crucial role since a lack of essential nutrients can lead to hair thinning and loss. Certain dietary deficiencies, such as inadequate protein, biotin, or iron, may directly affect hair vitality.

Stress is often linked to hair loss conditions like telogen effluvium, where excessive stress can push hair follicles into the resting phase, leading to increased shedding. Genetics is another critical factor; hereditary conditions such as androgenetic alopecia (commonly known as male or female pattern baldness) can significantly determine an individual's predisposition to hair loss.

While exercise contributes positively to overall health and well-being, its direct relationship with hair growth is less pronounced compared to the other factors mentioned. Regular physical activity may improve circulation and promote general health, but it is not specifically recognized as a primary factor causing hair growth concerns. Thus, exercise is not commonly associated with hair growth issues in clients, making it the correct answer.