Arm Extension

Primary: Triceps
Range of Motion: Arms laying on a pad, bent about 90 degrees at elbow, and then straightened.
Opposing Exercise: Arm Curl

Dip Assist

Primary: Triceps
Secondary: Latissimus Dorsi
Range of Motion: Kneeling on a pad, grab bars to either side, drop down, and push yourself back up.
Opposing Exercise: Lateral Pull Down

Seated Dip

Primary: Triceps
Secondary: Anterior Deltoid
Range of Motion: Seated, with hands on two bars at about mid chest. Push down with arms.
Opposing Exercise: Shoulder Press