The AB Lounge hurts my lower back?

[Dan]

ive had it for about the week by the way its the ab lounge 2 that i have. when i do it i do feel it in my abs but it hurts my lower back am i the only one? and why does my back hurt from doing this? the ab liunge 2 is supposed to help the starin on your back but im not feeling any relief just more straining ive tried it a million different ways