TIGHT LOWER BACK???
I was asked about poses that are good for a tight lower back and Hunny I'm the Queen of lower back tightness.
Usually it's not just the low back that's tight, it's the hamstrings and hips. In this case, when ever you are folding forward soften through the knees and add a little bend. This will allow flexion from the hips as you fold forward rather than rounding into the lower back.
In the two seated postures I did, sit with a long spine rooting both bum cheeks down into the ground and keep rolling the top ribs back and bottoms forward to ensure you aren't folding forward.
Take your time really feeling each pose and think "lengthen, lenghten, lengthen". I love bolsters but pillows do the trick just fine. I used two pillows off my bed to support under my knees. This takes the heat off my tight hammys and allows me to focus on that flexion in the hips and find loads of length in my lower back.
At the end I did happy baby, I find happy baby is hard to do in the beginning of your practice if you're super tight in the hips. I end up straining my neck trying to reach for my heals and my but is way off the floor. So once I'm loosened up I can really sink my knees deep. If happy baby still isn't your style you can take soles of the feet together, reach through your knees and pull them toward you. I did that in the video right after happy baby.
Hope this helps! #yogisspreadinglove