Jenna had really strong legs when she was a little tot. They were also very strong under my ribs when I was pregnant!! She used to like standing up on her legs in our laps from very early.
She was comfortably crawling at about 6m though, and then was properly walking just before 10m, so she had plenty of time to get all the stages in.

I didn't realise how strong Jenna's legs were until I cuddled a baby that had softer/weaker legs. For your info, the baby with the weaker legs was still walking by about 12-13m, after crawling for a good amount of time, which is completely normal