Good exercise to do with a heart condition/spinal injury?

Willow4
I want to get more into different exercises but I'm aware that I have to be careful. I faint a lot and can have seizures so I don't want to do anything really strenuous. I also have a strength imbalance in one leg due to a spinal injury so walking can be a problem sometimes.

I horse ride and I go to the gym sometimes but I struggle to find something I can do for longer than a minute. Anything where I have to get up quick is a no no.

Does anybody have any good suggestions? :)
Good exercise to do with a heart condition/spinal injury?
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