A dumbbell is a type of free weight used in strength training and fitness exercises. It typically consists of a short bar with weights attached at both ends, allowing for a variety of movements that target different muscle groups. Dumbbells come in various sizes and weights, making them suitable for beginners and advanced athletes alike. Using dumbbells can help improve muscle strength, endurance, and coordination. They are versatile and can be used for exercises like bicep curls, tricep extensions, and shoulder presses. Many people incorporate dumbbells into their workouts at home or in gyms, often alongside other equipment like barbells and kettlebells.