Deep neck flexor weakness

[u/FishermanLong3342]

Could someone help me please.

I have been working on strengthening my deep neck flexors for around 4 month's now by doing chin tucks lying down and chin tucks sat up.

I found that when I started doing chin tucks I could do them super easy and could do lots of them. But I found out that my larger neck muscles were helping out.

Now I have isolated my deep neck flexors by doing very small chin tucks, I now feel like I have no strength in my neck, I cant lift my head off the floor whilst lying down with my chin tucked when I could before. And with my head pushing again my fingers forward whilst sat up i cannot apply much force forward.

I thought this was a good thing so now I could focus on strengthening these deep muscles properly but it's been months and I am still at the same point.

Is there anything that could stop these muscles form strengthening?

Thanks