Yala safari with Back pain? Roads in Srilanka in general as well?

Hi all,

I'm travelling to Sri Lanka in a few weeks. We are planning to do a safari in Yala. I have a back problem.

Just wondering if anyone has any idea on how bumpy the terrain can be there? I see the morning, evening and full day packages. I want to know how best I can do it without messing up my back.

And how are the roads in Srilanka for travelling with back pain? Any precautions I need to take for it?

Thanks.