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Clenbuterol is primarily used by athletes due to its dual effects on the body, which encompass both asthma management and improved body composition. Originally developed as a bronchodilator for the treatment of asthma, it helps widen the airways, making it easier for individuals with respiratory conditions to breathe. This therapeutic application is crucial for athletes who may have asthma or exercise-induced bronchoconstriction.

Simultaneously, clenbuterol is known for its abilities to enhance body composition by promoting fat loss while preserving lean muscle mass. This makes it attractive to athletes looking to improve their physique and overall performance. The substance stimulates the body's beta-2 adrenergic receptors, leading to an increase in metabolic rate and a decrease in appetite, which can contribute to weight management and a more defined body.

The combination of these two uses is what makes the correct answer encompass both asthma management and improved body composition, as athletes may seek out clenbuterol not only for respiratory benefits but also for its performance-enhancing effects related to body composition. This multifaceted functionality is what solidifies the choice as the most comprehensive answer among the provided options.