1. Biceps brachii: This muscle is located in the upper arm and is responsible for flexing the elbow joint and rotating the forearm.
2. Gastrocnemius: This muscle is located in the calf and is responsible for plantar flexion of the foot (pointing the toes downward) and flexing the knee joint.
3. Rectus abdominis: This muscle is located in the abdomen and is responsible for flexing the trunk, as well as providing support and stability to the core.