A friend had a slipped disc injury from back when they were in a car accident a long time ago and they said that they can't run anymore because of the possibility of it coming out again (I guess that happened before post accident years later from running).
But they do want to get more fit, but it's hard for me to recommend a routine with that kind of lifetime injury.
Is there exercises for legs and back that would essentially be safe for them? I'd imagine doing certain back exercises over time would actually help their injury that they have, but I'm also not a doctor.
Tl;dr what exercises for back and legs can then do that is very low impact on the spine/discs?