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Back in the late 80's early 90's laser sailors would have back problems when they used the, (at the time legal) weight jackets to help hold the boat down. Their bodies were not conditioned to hold the extra upper body weight and it put strains on their lower backs. Several younger sailors screwed their back up with the jackets.
I don't think that hiking will do anything to your back, more just your legs and knees, but crouching down up near the mast on a windless day might do something. I think the best advice you could get would be from a doctor or physio that knows something about what laser sailing is about.