Write the type of joint which is used for each of the following movements:
A person lifts weights to build up his biceps.

Explanation

### Step-by-Step Solution:

1. **Identify the Movement**: The question asks about the type of joint involved when a person lifts weights to build their biceps. This action primarily involves the arm and elbow.

2. **Understanding Joint Types**: There are different types of joints in the human body, such as hinge joints, ball-and-socket joints, pivot joints, and others. Each type allows for specific movements.

3. **Focus on the Elbow Joint**: When lifting weights, the primary joint that is used is the elbow joint. The elbow allows the forearm to move up and down, which is essential for lifting.

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