San Diego Running Meetup
SDR is the largest running group in San Diego boasting several runs everyday of the week!
http://www.meetup.com/SanDiegoRunning/
American Council on Exercise
ACE is considered one of the fitness industry leaders and is internationally respected for its continuous research and innovation.
http://www.acefitness.org/fitfacts/default.aspx
Hal Higdon's Marathon Training
Hal Higdon is an authority on marathon training and offers a plan for beginners.
http://www.halhigdon.com/
Fit Day
Fit Day is an excellent free resource for keeping a food log, creating a weight goal and monitoring personal progress.
http://www.fitday.com/