What kind of exercise would be safe for a disabled person?

My husband had a spinal fusion a few years ago, that has left him disabled and in a great deal of constant pain. He now wants to loose weight, but can’t do a much of physical activity. His diet is very healthy, but that doesn’t help to loose weight. Are there any disabled people out there that have a regular exercise routine?

What is the best upright exercise bike for a tall person?

I was wondering if there are any upright exercise bikes on the market suitable for tall people. I am 6′2” and 200lbs.
I have tried out a Schwinn 140 in a nearby sports store but my knees just about hit the handlebars. The only bike in the store that was a good fit was a ProForm but I’ve read bad reviews about those.
I don’t have an outdoor bike and don’t want a recumbent exercise bike. Any advise would be much appreciated.

What dance exercise videos do you recommend for a person trying to lose weight?

I’ve seen that dance exercise video infomercial on TV where they teach Latin American dancing in a workout. Do you know if there’s any with different styles besides that? I guess I’m looking for one that teaches more of an American style. Do you have any suggestions? Thanks in advance for your answers.

What are some good exercises for a person who does not exercise start off with?

I am trying to make exercise part of my daily routine. I need to start slow to keep my motivation and stamina up. Any ideas (other than walking) of what I should start off with?