Can anyone tell me what machines at a general gym can help strengthen knees and ankles?

I know walking and such activities can help overall, but I am looking for something to add to help my legs not be so weak.

I do not just mean strength as I have an issue where I have always walked on the outside of my feet. So somwthing that can help strengthen, but also with flexibility or something to that effect.

I need physical therapy, but am unable to get it for a while, so I hope some of you may have some suggestions.

Thank you in advance. : )

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