http://www.bodywindow.com/yoga-strap.html
2) A little bit here on how to release that deep hip flexor (that one that lets you lift your leg in front of you when walking, climbing stairs, or even helping to hold you upright) that can give you back pain if it's too tight:
https://yogainternational.com/article/view/release-tension-in-the-psoas
3) And how to get your legs and upper body and arms active in Triangle Pose so you never lean toward the ground, but always lift up (and avoid knee problems as well).
https://yogainternational.com/article/view/why-its-so-easy-to-hyperextend-your-front-knee-in-triangle-pose-and-ho
2) A little bit here on how to release that deep hip flexor (that one that lets you lift your leg in front of you when walking, climbing stairs, or even helping to hold you upright) that can give you back pain if it's too tight:
https://yogainternational.com/article/view/release-tension-in-the-psoas
3) And how to get your legs and upper body and arms active in Triangle Pose so you never lean toward the ground, but always lift up (and avoid knee problems as well).
https://yogainternational.com/article/view/why-its-so-easy-to-hyperextend-your-front-knee-in-triangle-pose-and-ho