Here are a couple of websites with free references:
https://quickposes.com/en/gestures/timed
https://line-of-action.com/
However, most of the images aren’t specifically taken with figure drawing in mind, therefore the lighting, poses, etc. are not ideal for someone learning (in my opinion).
This studio sells reference image packs that are actually aimed at artists, for a reasonable price:
https://gumroad.com/grafitschool?sort=page_layout
For $12 you can buy a reference pack which usually has a specific theme. Some contain 300 or so references, others have 1500+
Alternatively, you could go outside and sketch people you see. This is a lot harder but will help a lot if you stick to it!
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