Does anyone know some good exercises that can help relieve anxiety?

Yes, one of the best exercises used in coaching practice is 54321 method. It is proven to be one of the most gentle and calming exercises when facing anxiety or panic attacks. When you are in a situation where you feel anxious, it is an easy grounding technique that helps your anxiety to calm down. Here's how you do it- Name 5 things you can see, 4 things you can feel, 3 things you can hear, 2 things you can smell, 1 thing you can taste. Combine that with deep breathing 4x4 and it will help you release anxiety. I hope this will help you.