Also Chris N,

About your question of static holds. I support this training because static holds target your slow-twich(ST) fibers. ST fibers are responsible for prolonged endurance activities. You should research a technique called X-Reps.
I do X-Reps for one week after 3 weeks of normal training. It increase my muscle endurance capabilities.

To hard to explain here so look it up on:

www.bodybuilding.com