I've been conflicted lately. Luckily I'm able to change my weight really easily depending on what I want, speed or mass(cushion/power). However, which one is correct for karate?

I wrote about this in my blog here: http://karateknowledge.blogspot.com/2011/07/ideal-karate-body.html

Please comment here or at my blog, I like the discussion and don't mind criticism. I'm just here to progress, thank you.