David have you done a cruise before involving Zodiacs? We have not met so I don't know what your physical abilities are but really the Zodiacs are not that hard to get into and out of. The crew are really good at helping. Usually there are 2 crew at the bottom of the ramp to help you with the step on to the Zodiac and 2 in the zodiac to help you with the step in to the boat. My husband and I are by no means physically "fit" but neither of us has ever had a problem with this in 4 exbedition cruises.
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Helen