Are triceps involved during bicep curls?

Triceps are indirectly involved during bicep curls.

The biceps brachii is the primary muscle responsible for elbow flexion, which is the motion performed during a bicep curl. However, the triceps brachii, which is located on the backside of the upper arm, also plays a role in this movement.

During a bicep curl, the triceps act as synergists to the biceps. This means that they help to stabilize the elbow joint and prevent it from hyperextending (straightening beyond its normal range of motion). The triceps do this by contracting isometrically, which means that they generate force without changing their length.

So, while the triceps are not directly involved in elbow flexion, they do play a supporting role during bicep curls.