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Bonnie, The thing about exercise bicycles is that they can be a pain in the butt -- literally. Comfort would be for me the #1 criterion. For some reason, many of the seats do not have the right padding and/or do not conform to the shape of the human bottom, at least to mine. You can buy supplementary padding, but that may not make it better. When shopping, you don't necessarily feel the discomfort that you might feel after actual use. I would suggest that your father try out a likely candidate for the longest time period he might actually exercise with it, and even repeat this another day or two before the final purchase decision. I learned the hard way, and I was sore at having bought a model that never sat well with me. Phil Tompkins Hoboken NJ age 60/dx 1990