I only started to include free-weight exercises in my gym routine a few months ago but I'm a convert to the idea that free-weights are superior to weight machines (and more enjoyable - I look forward to squat thrusts, the intense focused effort feels like it does you good). I originally got a free introductory lesson at my gym which involved about five core exercises, but now I would like to expand my routine. Any ideas on best way to proceed? Is a personal trainer a good investment? (I would rather pay for some lessons than get an injury!). What about websites and books?
Thanks, Paul.
(p.s. For websites and books, I am also generally interested in how exercise works and best ways to exercise, not just guidelines for free weights.)

The website for ACE is a good resource. Google American Council on Fitness. They will send you a good newsletter too!

Muscle and Fitness has always been a great source of information, covering the entire gamut of muscle-building.

http://www.muscleandfitness.com

Best single book ever is New Rules of Lifting, available at Amazon for about $15, get yourself over $25 with another book and its free shipping.

thanks all, the websites are great (exercise photos at ace very useful) and i'll take a look at the book this evening.