These are the six competitive disciplines:
Constant weight without fins (CNF)
The freediver descends and ascends under water without the use of propulsion equipment or pulling on the rope. Constant weight without fins is the most difficult and natural depth discipline, because of absolutely no propulsion material to go down in the water. This discipline needs a perfect technique and coordination between propulsion movements and equalization.
Constant Weight (CWT)
The freediver descends and ascends using his fins or monofin without pulling on the rope, only a single hold of the rope to stop the descent and start the ascent is allowed. The freediver has to come back to the surface with the same amount of weight he started. Constant weight is the most common depth discipline of freediving.
Dynamic Without Fins (DNF)
The freediver swims in a horizontal position under water to cover the greatest possible distance. Without any propulsion aids. This discipline needs a perfect technique and coordination between propulsion movements and streamlining.