Bicep curls are a popular strength training exercise that primarily targets the biceps, the muscles located at the front of the upper arm. To perform a bicep curl, you typically hold a dumbbell in each hand with your arms at your sides. As you lift the weights, you bend your elbows and bring the dumbbells toward your shoulders, then lower them back down to the starting position. This exercise can be done standing or seated and can also be performed using a barbell or resistance bands. Bicep curls help improve muscle strength and definition, making them a common choice for those looking to enhance their upper body fitness.