The EZ bar preacher curl and dumbbell incline curl are both exercises that focus on the biceps and forearms. The preacher version keeps your arm in a fixed position, which helps isolate your biceps. The incline curl puts your arms in a stretched position at the bottom of the curl, which enhances the range of motion and as a result, gains. (In need of some dumbbells? We like from CAP Barbell.)
Single-arm pressdowns and the decline EZ bar skull crusher both target the triceps. The single arm-pressdown isolates the tricep muscle by moving only at your elbow. The decline skull crusher puts you at angle that enhances the range of motion of the skull crusher, so there is constant tension on your triceps. (You can also find these exercises in our Badass Arms training guide.)