Bicep curl /Tricep extension combo machineThe Mac Strength Bicep Curl Tricep Extension machine is the perfect machine for working your biceps and triceps directly, as this machine allows your bicep muscles contract both concentrically and eccentrically during the bicep curl and when you curl the weight up, the biceps muscle creates enough force to overcome the external resistance. Additionally, the tricep extension helps to target the muscles of the long head of triceps . Tricep extensions