I will be accompanying 75 yo Dad on a trip to California for a week of sightseeing with a group tour. He will be in a wheelchair most of the time but can walk slowly to a bus or a cafe. I am a 49 yo daughter, in ok fitness, and will be pushing Dad in his wheelchair. I would like to get stronger so I can handle the physical tasks of lifting a 50-pound wheelchair out of a car or bus, and pushing a 230 pound elder parent safely and confidently. Any suggestions or weight-training tips would be greatly appreciated!