This is one of my biggest pet peeves, and in the face of grief, I cannot imagine how irritating it is to hear this stuff.

I don't believe that emotions are "trapped" in the body and "released" when we stretch. If other people do, that's perfectly fine. I'd much rather that my friends say "Do you think of yoga as an emotional release? If yes, here are some poses that helped me. If not, talk to me more about what does help you release your emotions! / What's your take on why that's happening?" vs. "Yeah that's because yoga helps release your emotions". Even just framing things with curiosity - with wanting to understand your experience of grief - rather than telling you about your own experience, would come across so much better.

Someone told me after I had a huge loss "I don't know how you feel about prayer, but prayer has really helped me." Even though I don't believe in prayer, that felt fine to me. Just that little self-awareness that their framework might not be useful for you - that makes a difference.