Dynamic apnea is the challenge of swimming long distances on a single breath. This is split into two disciplines, one with and one without fins.

In dynamics with fins, freedivers swim with either a monofin or bifins. Dynamics without fins is typically swum using underwater breast stroke for efficiency. To succeed at either, the diver must learn to make themselves as hydrodynamically efficient as possible and conserve their energy.

Lazy Seal club members Dave Mullins and Kathryn McPhee hold world records in dynamic without fins and Dave also has held the world dynamic record!