some of the elasticity in your skin will help in tightening up but it depends on how dramatic the weight loss was. If you build some muscle it will also help in filling out the loose skin. Depending on how long you have been waiting for your skin to go back, surgery might be a good option. I would talk to a Dermatologist first before doing anything regarding surgery.
As for you knees, squats and lunges. If you build up your legs it will give the appearance of smaller joints.
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