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Man, crossfit is worse than politics when it comes to eliciting opinions. I don't do it, but am familiar enough with it, and have plenty of experience with many of the movements, lifts. I'd say just use some good common sense. So, are you using good form? Getting any injuries from it (then something's wrong)? Don't use crazy weights etc. Honestly, at your age (and I'm not too far away), I'd probably lean toward a solid free weight routine, with solid and controlled movement. Just my two cents.
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