Chin-ups are a strength training exercise that primarily targets the muscles in the upper body, particularly the latissimus dorsi, biceps, and trapezius. To perform a chin-up, an individual hangs from a horizontal bar with their palms facing towards them and pulls their body upward until their chin is above the bar. This exercise can be done using various grips and can be modified for different fitness levels. Chin-ups are often included in workout routines to improve upper body strength and endurance. They can be performed in gyms or at home with a suitable bar. Regular practice of chin-ups can enhance overall fitness and contribute to better posture and muscle definition.