Keep your flexibility/mobility training to a maximum. Prevention and Recovery is numero uno during your peak season. Second in my book would be core (abs, obliques, hips) training involving endurance-based exercises that resist lumbar spine movement. As PowerManDL said, add in some squatting and lifting movements to keep the kinetic chain of movement in sync. Lastly, keep your form as perfect as possible, your reps lower than 10 and your intensity below 80%.
Check out this video for some good exercise ideas.
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http://www.youtube.com/watch?v=O3-ft6jnorQ