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Fitness Theory and Practice. CrossFit's rationale & foundations. Who is fit? What is fitness?

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Old 11-09-2004, 09:34 AM   #1
Graham Hayes
Member Graham Hayes is offline
Join Date: Sep 2003
Location: Sidmouth  Devon
Posts: 880
A concept that has been mentioned a few times is that at insignificant loads an exercise has a natural period. In the September 2004 CFJ the period for 3 exercises that are used in the WOD were given.

This link shows Crossfit's foundational exercises,

I think there are some more that can be added to that list now though (burpee, knees to elbow...)

Anyway I was wondering what the natural period of these exercises are for the purpose of measuring my performance against what I could do if I could blast through with no rest. At the moment I guesstimate that a particular excersise will take 1 or 2 seconds per rep and figure it out from there, however I'm still interested in a more presice estimate.

I know I'm being lazy just asking for the information to be handed to me but...pretty pretty please!
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Old 11-09-2004, 12:39 PM   #2
Carl Herzog
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Join Date: Sep 2004
Location: Scotia  NY
Posts: 128
In most exercises, gravity is the main determining factor. Consider air squats. The drop down can essentially be no faster than a free-fall for the same height. Going back up you must limit the force you exert exert so you don't get airborne. End result: the natural period is going to vary with your travel distance. Short people have a real advantage here.

Other exercises can be analyzed similarly, but travel distance will often be the main variable. Sometimes you can fight it a bit. E.G., instead of letting yourself drop from the pullup bar you could try to push yourself down.

Want a higher Tabata squat score? Fasten your feet to the floor. Maybe you could then pull yourself down and push up as hard as you are able. Anyone who tries this should post their results.
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Old 11-09-2004, 05:11 PM   #3
Chris Forbis
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Location: Joplin  Missouri
Posts: 922

Never bothered thinking about it that way. Now I have an excuse (6'4") for having miserable tabata squat numbers! :-)

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Old 11-09-2004, 05:29 PM   #4
Jeremy Jones
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Join Date: Jul 2004
Location: Concord  Ca
Posts: 1,218
I am 6'4" and I don't think I could do much better than my best of 21 (maybe 22 or 23), but If I were to attach my feet to something. . . that sounds like fun, and a real way to get higher numbers.
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