https://www.google.ca/search?q=stretch+lower+leg+back&newwindow=1&espv=2&biw=1920&bih=947&tbm=isch&imgil=zgK6o0PnTKZ64M%253A%253BYt_rrlFVJob_oM%253Bhttps%25253A%25252F%25252Fwww.reddit.com%25252Fr%25252FFitness%25252Fcomments%25252F2vm422%25252Fmiracle_stretch_for_lower_back_tightness%25252F&source=iu&pf=m&fir=zgK6o0PnTKZ64M%253A%252CYt_rrlFVJob_oM%252C_&usg=__OS3u-WfaflWwjkkbCv4RMriBmmE%3D&ved=0ahUKEwiJy5qexdbJAhUHz2MKHawdBr0QyjcIJg&ei=STBsVsmCA4eejwOsu5joCw#imgrc=zgK6o0PnTKZ64M%3A&usg=__OS3u-WfaflWwjkkbCv4RMriBmmE%3D
一定要坚持，大概一个星期可以感觉到不同。我做了一个月完全好了。
你的症状听起来像是Post partum arthralgia，荷尔蒙造成的。
这种情况怎么治呀？实在很痛苦！
