It's been a little while, but today's workout includes supersets to bump up the intensity (and density) of your training session while saving you time. They'll allow you to overload your muscles to cause fatigue, damage, and—most importantly—growth!
Today's superset will target two different heads of your triceps for complete development. Just remember to adjust the weight as needed. Since you're hitting the same muscle group back-to-back without rest, you might want—or need—to decrease the weight on the second exercise.