Unique, creative logo required for fitness website

Silver Fitness Training (silverfitnesstraining.com)

Silver Fitness Training provides outdoor group training ('bootcamp') and indoor/outdoor one on one personal training services to people of all levels of fitness in the Northern Beaches region of Sydney, Australia. Our trainers are licensed to work out of Fitness First gyms. We are dedicated to helping people achieve their fitness training goals. We will be introducing a 'Sliver Fitness' range of training/work out clothing in 6-12 months.

We want a logo that is strong, bold and simple, that conveys our brand. Key words to think about when designing include fitness, movement, motivation, strength etc. We are keen to see how creative you can be.

We will be using our website to promote our services to new clients (those who have never exercise before, through to people who have but want some extra help) and existing clients (via a portal, where they are provided with fitness tips and help).

The logo will initially be used for our website and business cards, but will eventually be embroidered and screen printed on the clothing line, so please keep this in mind when designing. It would be ideal if the logo could be used on both a white and coloured/black background.

In terms of our style think http://www.apple.com (clean, simple, web2.0). Other good examples of the style we like includes mozilla.com, twitter.com, mosso.com etc. We don't really have any colour preferences.

We want:
Great logo!
Clean, crisp, simple, bold, strong, creative, web2.0 design
Image associated with text to convey our brand (fitness, movement, motivation, strength etc)
Image available in a range of formats (jpeg, EPS, photoshop etc)