Dynamic Apnea covers two of the eight categories recognised by the International Association for the Development of Freediving. That of Dynamic Without Fins and Dynamic With Fins. Both disciplines require breath held dives

Apnea

Apnea, apnoea, or apnœa is a term for suspension of external breathing. During apnea there is no movement of the muscles of respiration and the volume of the lungs initially remains unchanged...

 where the diver travels in a horizontal position under water under their own power without aid/physical contact of a static surface, with the exception of the pool wall when done indoors. The records can only be recognised in pools of 25m or greater.

The other categories recognised are: static Apnea

Static Apnea

Static Apnea is an AIDA International discipline in which the freedivers hold their breath for as long as possible with their respiratory tracts immersed, their body either in the water or at the surface...

, No Limit, Variable Weight, Free Immersion

Free Immersion

Free Immersion is a AIDA International freediving discipline in which the freediver dives under water without the use of propulsion equipment, but only by pulling on the rope during descent and ascent....

, Constant Weight

Constant Weight

Constant Weight is an AIDA freediving discipline in which the freediver descends and ascends using his fins/monofin and/or with the use of his arms without pulling on the rope or changing his ballast; only a single hold of the rope to stop the descent and start the ascent is allowed...

, Constant Weight Without Fins

Constant Weight without fins

Constant Weight Without Fins is an free-diving discipline in which the free-diver descends and ascends by swimming without the use of fins or without pulling on the rope or changing his ballast; only a single hold of the rope to stop the descent and to start the ascent is allowed...

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Sources

AIDA - Association Internationale pour le Développement de l'Apnée