Straight legs on back handspring
I have been doing backhandspring series down the mat, and never can seem to get my first couple of handsprings with straight legs, they are always bent a little bit at the knee. I don't know if its back flexibility that I need more, I think I have enough, I can do backbend and ups, but don't know how to use it that much when I do a bhs. I have enough flexibility I think, with shoulders and back, but my back always turns out straight kind of when I throw a bhs, with bent legs. I have been told before to throw your hips up to get it to bend more but not as much luck as I would like with that... any ideas?