Whale gymnastics aren't limited to breaches. They include tail slaps, pectoral fin waves and slaps, spy hops, back-layouts, and something that looks like a shoulder roll.
First up: spy hops. The whale raises its head enough to expose its eyes and looks around. It may then reenter the water by slipping back under, or more dramatically and loudly.
Two humpbacks spy hop together:
And reenter together, with a crash and a dive.