TSugg,
I use a Crack if Dawn Spider seat with the high back. Im 6'2", everything bugs my back but I seem to do alot better now that Ive gone to this one with the high back. Its very thick and stiff padding so your arse isnt going through it and your back feels supported. Also Remind em to move around a little to change up the positions...just like driving a car all day. Also dont sit on their wallet, use a foam roller at night, 800 mg. Ibuprofin, Alternate heat and ice, jacuzzi jets go a long ways, stretch often, do more ab/core work, lay off the In-N-Out(naaa skip that one). Best of Luck