Your biceps may be the “show muscles” most people think of when they see toned arms, but did you know that your triceps actually make up about three-fourths of the muscle in your upper arms? This workout will both tax your triceps and open up your chest. With moves like reverse planks and modified dips that don’t require any equipment, you can build strong, shapely triceps to round out your arms. Can you make it all the way through this challenging series with perfect form?