A full circle of tension for the whole chest.
Go light and slow. This lives or dies on control through the full arc.
Around the Worlds sweep light dumbbells in a huge arc from your hips to overhead and back, which keeps the chest under tension through nearly its entire range instead of the narrow slice a press covers. The pecs work the whole circle with the shoulders assisting through the wide midpoint, and the slight elbow bend keeps the stress on muscle rather than joints. They earn their place as a stretch-heavy finisher that finds fibres pressing leaves untouched, provided your ego stays out of the dumbbell rack.
Light, lighter than feels impressive. The arc puts your shoulders in a long-lever position where heavy weight turns into joint stress, and the exercise pays off through slow control and constant tension, not load.
A flye travels one path, out and up over your chest. Around the worlds trace the full circle from hips to overhead, so the chest gets loaded across many more angles in a single rep, at the cost of needing even lighter weight.
Across your whole chest, with a deep stretch as the dumbbells sweep wide, plus work in the front of the shoulders near the top of the arc. If your lower back is arching to help, drop weight and press your ribs down to the bench.
