Ace the NCCPT Personal Trainer Exam 2026 – Shape Your Future with Confidence!

The bicep curl primarily involves flexion, which is the motion of decreasing the angle between two body parts, typically articulating at a joint. When you perform a bicep curl, you are curling your forearm up toward your shoulder, which in turn causes the elbow joint to flex.

This movement is characterized by the activation of the biceps brachii muscle, which contracts to pull the forearm upwards. Flexion at the elbow is a crucial movement in many exercises, particularly those targeting the arms. Understanding this type of motion is important for identifying proper form and technique during strength training exercises.