Part of my issue is that since I'm not visually oriented, I struggle when I have to describe physical action. It's not that I can't, but it's much more effort than finding character voices and motivations and emotional process, so when the story needs action I have to make a more conscious point of putting it there. At that point I recruit people to choreograph the scene for me so I can actually see it as I write it. It seems to work, because people speak well of how clearly they can visualize the scenes as written - but I can't, after enough time has gone by for me to forget and I'm just re-reading.