It took FOREVER for me to find a workout plan that wasn't aimed towards wussy girls ("women should just focus on toning because actual strength training builds bulky muscle, which looks really bad in the kitchen" *eyeroll*) or towards experienced male body builders.
The focus on building back and shoulder muscles is often lost in the hyper focus on leg speed and strength, but after years of hard contact & speed skating stance, you'll need them to be strong to keep neck, shoulder, and back injuries at bay. Back pain during endurance drills is because the muscles are *over stretched* due to good derby form. Make them strong, and the pain will stop. :D // Derby