Energy efficiency. Try doing a dive/dynamic:
a) just with dolphin kick
b) just with breaststroke kick
and see how far you get with each. It may add speed (fractionally) but is usually used to compensate for an uncontrolled armstroke that bends the body at the waist.
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2) Why do they glide with arms down?
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Velocity is greatest after the armstroke. Gliding with arms in front requires significant extra work from the shoulders. Hydrodynamics doesn't change drastically (torpedo shapes, like a tuna, have less water resistance underwater than long skinny shapes).
With accurate balancing you should get the same distance in DNF pushing off the wall with your arms up compared to down, and terminal freefall velocity in CNF is more or less the same between the two.
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Why such a fast stroke cycle?
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As Wes explained, stroke frequency changes with buoyancy.
I would add that depending on dive strategy a more relaxed stroke can be more cost effective than vigorously perfect technique.
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I was looking into his classes (William T.) as well, maybe if there are some people that have taken his advanced no fins class they could chime in on this thread with any advice/recomendations, how they progressed from the course.
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Monkeyhatfork, we are running
one CNF course in November, with the opportunity to continue training free of charge in Dean's Blue Hole afterwards.
As well as working on technique, during the courses I work with students to design the most energy efficient dive strategy for their body type (height & density), target depth, cold tolerance etc. A freediver who was training with me earlier this year developed a dive strategy very different to my own which took him all the way to 65m in CNF.
There are still some places left in the December 3-5 course. Minimum performance requirement is either:
- 25m CNF
or
- 75m DNF
and 30m+ CW.
Topics include:
- perfecting CNF swimming and freefall technique,
- exercises to maximise TLC:RV ratio (thereby extending equalisation capacity),
- hands-free equalising & mouthfills,
- CNF training tables to increase hypercapnic resistance (and resistance to CO2 narcosis, if required),
- specific asanas and stretches for CNF flexibility,
and the advanced stuff...
- M.E.E. a formula that determines optimum buoyancy and dive strategy for minimising energy expenditure,
- use of yogic bandhas to diffuse contractions and induce 'infinite regression' of metabolism and heart rate,
- no warm-up diving to maximise MDR,
- psychology: mental anchors, visualisation, positive affirmation and contingent programming of the unconscious,
- meditation: pranayama and brain frequency entrainment (binaural beats).
If anyone is interested in the course they should contact me soon at
info@verticalblue.net
Cheers, William Trubridge.
