One of the reasons that I like this yoga pose so much, especially when grabbing my foot from behind my back, is that it tends to “release” my lower back. (Another good pose for “releasing the lower back” this is triangle pose.)
In Bharadvajasana one leg is in hero position with the shin folded to the outside of the thigh. The other leg is in lotus with the top of the foot on top of the other thigh.
As a beginner, it might be hard for you to perfect laying the weight of your entire body on the twisting side. You might end up tilting on that side, which will lead to compr
ession of the lower back. To avoid this, raise your buttock using a blanket that is folded thickly. Then, consciously sink your buttocks towards the floor.