Clenbuterol is a powerful bronchodilator originally developed to treat asthma, but it's widely known in the fitness and bodybuilding world for its potent fat-burning and thermogenic effects. It works by stimulating beta-2 adrenergic receptors, which increases the body’s core temperature and metabolic rate, leading to enhanced lipolysis (fat breakdown) without significant muscle loss. Athletes and physique competitors often use Clenbuterol during cutting phases to maintain lean muscle while aggressively reducing body fat. It can also provide increased energy, appetite suppression, and a mild performance boost. However, due to its stimulant nature, it must be used cautiously, as it may cause side effects like jitteriness, elevated heart rate, or insomnia, especially at higher doses or over extended periods.