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Once you get into this work for any period of time, it will drain you, make you old fast, and just plain out abuses your body
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I respectfully disagree. My Dad is 67 and still climbs like a squirrel, and he is retired living on a gentelman's farm. I think if you focus on staying healthy to a degree, ergonimics at work, and using the energy saving technology and techniques available, it will keep you young. Look at the Geezers competition, 5 years and I'm there, can't wait. Those guys are doing fine. You really don't see many obese climbers. I always wonder how good climbers that smoke could be if they quit the butts. Training can keep you from being drained so fast. Look at the past ITCC Champs, not really young bucks. My Boss is 54 and still grinding at a respectful speed. Poor ergonomics for an extended period of time, poor health habits, and resisting changes that can help you do have the potential to drain you and make you old fast. I feel great now, in shape, and I think that will really pay off when my rehabilitation starts. Think outside the bark.