If you suffer from a back problem but love your cycling, I would recommend purchasing a suspension seat post. You might want the seat adjusted slightly higher as your weight will compress the post a little. These are ridiculously low price!
Very comfortable ride reasonably lite
no adjustment in angle of seat
This took only a couple of minutes to fit & is very effective at damping out minor bumps in the road. I've not tried it yet on rough tracks but I'm hopeful that it will perform well.
Improves comfort whilst riding.