The answer is the quadricep muscles. They are engaged whe you use the leg extension machine.
Hope this helps! :)
Answer:
I'm not sure, but I think it's smoking, or vaping. Or it could be uninetional ingeries. And I would like to be your friend :)
Explanation:
This could make an organization more successful, because they have been there longer, people will know who they are, the word will get out to people about them, it will become a trusted part of its community