hamstrings give out in Arch body hold

When i do arch body holds my hams give out first before low back. Is it normal?  Is it lack of flexibility or strength or both?

Normal. I also feel it more in my hams than lower back and others have said the same. It's individual.

I have spaghetti for legs so I always felt it more in the back. I'm also average height for those who are tall with big legs it's probably natural to feel it in the legs more. As Christian says it's individual - nothing to worry about though.