The SufferfestLogo Design Contest

Hi Everyone. Thanks for your designs to date. There are some interesting ones there.
Most of you are working with cranks, cogs and the like. That's good, but perhaps other parts of the bike would be interesting - wheels, deraillures, handlebars, saddles, etc. Also, please take a good look at cycling cranks and cogs, etc. to make sure that the image you are using is current.
Also, it would be good to see some things that aren't quite so obviously cycling related, but have something to do with The Sufferfest.
For example, The Sufferfest is about a structured workout of intervals, where you make very hard long efforts, then have short rests, then long, then short...perhaps some sort of pattern that reflected this. Or something that reflects hill climbs and flat lands.
Also, heart rate is very important when working out, so a heart rate chart might be interesting or something showing increasing power.
Explosion of power!
Let's not forget legs! Those are what power a bike, after all.
Cracks under pressure.
Tears of pain.
A Pool of SWEAT! (most customers talk about how they leave a pool of sweat behind after every workout)
Pushing yourself to the very limit.

I'm going to extend the contest to see what else we can come up with if we explore these ideas and any others you have. Most of my comments are in the individual logo comments section, so please look there for further inspiration.
Feel free to explore some colors other than red!

Hi Guys - thanks for all the ideas. Please keep them coming. The contest is still wide open as I still haven't found exactly what I"m looking for - please read the comments for more ideas/insight, and the brief as well. And please ask me questions!!!! A dialogue is always the best way to work together!