The compounding movement feels wrong

I want to take the compounding stress off my back though (Guild Wars2 Gold). I want to change the angle of my back movement where I force more of the weight bearing on my hips than feet. I can dead lift things all day long like anybody else, but I yearn for the angled exercise that I can normally do on a roman chair or picnic table.

I think that the pipe system for the pull up bar works great in the door way. I wonder if something lightweight like that could be designed to be placed on the floor, using the doorway to support doing a lower back exercise or sit up? Doorways are supposed to handle 400 pounds.

I need something to stabilize my feet when I bend over.

I'm looking for a decent way to work my lower back better, preferably in home (Guild Wars2 Gold). I like using the picnic table, but the weather is getting a little chilly right now

I have limited space, in fact, virtually no space, since i live out of my car. I do have good access to a doorway to set up a pull-up bar. Is there anything out there that can work the lower back supported by a door way. It seems like something should be possible, right?

I'm trying to motivate myself to exercise more in my apt (where it can be chilly in the Winter since i keep the heat low). I would be more motivated if I had some 'cozy'...maybe fleece type outfits for the winter...i'm thinking sort of like a fitted sweater top...but that's not too tight that I can't move around...but that's tight enough that I can see my form/shape. Ditto for the pants. They could be full length pants or mid thigh...but the fabric has to be warm...not like a cold nylon or anything.

Can any women reco a brand that might work for this (Guild Wars2 Gold)? Yoga or pilates type stuff is also fine...it's mainly the fabric I want to be soft/warm and the fit to be form-fitting but still allow for full range of motion.