Freediving disciplines and AIDA World records

Constant Weight
The diver must descend and ascend kicking and completely unassisted. The diver may wear weight, but whatever is taken down must be returned to the surface. This is the truest form of Freediving and the toughest. Descending in the easy part. You need 80% of your strength in returning to the surface, using all the major muscles in your body when you O2 levels are at their lowest.

Variable Weight
The diver descends on a sled (with up to a third of their body weight) and returns to the surface under his or her own power, either kicking and/or pulling on the rope, or a combination.

Free Immersion
The diver must descend and ascend by pulling on the rope. Weight may be worn, but this is simply variation of the constant weight category so the diver must return to the surface with the same amount of weight used for the descent. No fins are worn.

No Limits
The deepest free dives in history are made in this category. Here the diver uses a weighted sled, descending at a rate of 3 - 4 meters/second.
Ascent is assisted by an air filled balloon, which the diver has to manually activate upon arrival at depth.

Static
The diver holds his/her breath floating face down in a swimming pool.

Dynamic Apnea
This category is divided in two, with fins and without fins. The divers swim horizontally not more an a meter (3.28 ft) under water in a swimming pool.

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