Another vote against, might even be a study done about it but common sense prevails.
No matter what you do, downhlil skiing, skinning and bootpacking in ski boots is different from what you can reasonably train in the offseason. The goal of your off-season should be general strength/conditioning. Some things I think help:
Squats (back/front, DB split squats are good too)
Deadlifts/RDLs (hamstrings and butt + torso strength)
Weight step-ups (I prefer barbell on back, can do these with a light load like 95# for 100 reps, kind of feels like bootpacking)
Running/hiking, good for conditioning/endurance
Don't forget the upper body, shoulder press, bench pull-ups (balance your push/pull)
As Meat said, a strong torso is important to protect your back and groin. If you are a desk jockey, work on your hip mobility in the off season (
http://www.mobilitywod.com/ is a great resource). If you have tight hip flexors/dormant glutes from sitting in a chair all the time, your lumbar spine is going to take a beating in many athletic pursuits, including running.
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