I've read that on the standing pike we are supposed to keep APT. However, because my flexibility is not that good yet, I'm unable to do that:
As you can see, my back is rounded. To prevent this, I can actively keep APT and only bend as far as I can, maintaining it, like this:
The problem with this though, is that it's really tiresome for my lower back muscles to maintain this pelvis position. Even when I place my hands on my legs, or on a chair in front of me. I might be able to complete 2 minutes, but for all the exercises after this one, my lower back is too tired to maintain proper form.
Has anyone dealt with this issue?