This was on the boat with Jason & Sarah - Alex was exercising her lungs. She wasn't crazy about the life jacket and she hated not being able to jump overboard at her leisure so hopefully as she gets older she'll find her sea legs.
Here is a video of Alex watching TV in her new chair. It's the first time that she is really sitting still and focusing on something for longer than a few seconds - usually she's in constant motion. The way she's draped over the chair is hysterical, I don't know where she got the idea from to do that. Looks pretty comfy though.