Depending on the type of lower back pain you have, you might need to modify it differently than I do. I have a herniated disk in my lower back that is chronic but usually OK. Depending on the day, the only two poses that I sometimes have trouble with are the standing forward bend and upward facing dog.
For standing forward bend, I make sure that I only fold as far as I can for the day while keeping my lower back flat (not rounded) This often means that for the following pose (flat back) I put my hands on my shins to give me the leverage. Usually over the course of a yoga practice, my back loosens up enough that I can get my hands to the floor, but I start out slowly.
Then, in upward facing dog - this one usually feels good on my back, but occasionally not, in which case, I substitute Cobra until my back loosens up.
An extra tip: For downward facing dog, my yoga teacher suggested that in setting up this pose, I bend my knees a little bit and arch my back a little and thenn straighten the legs keeping the slight arch. He calls it "putting some upward dog in your down dog" - It is subtle, but helps to protect that you don't round your back in downward dog.
I also don't jump in or out of downward facing dog, as I don't have the core strength yet to do it properly and controlled, and to really "jump" at this point is jarring on my back.
| current weight: 144.9