I’ve been playing tennis for a long time and just recently picked up squash. During tennis workouts, my coach used to say to shadow strokes before practicing them with tennis balls. This helps build your technique and gets your feet moving. During squash practice, my squash coach said the same about squash. She said, for a part of our warm-up, we’d be ghosting strokes because that helps build technique. At that moment, something clicked in my head; those two actions are essentially the same, right? In Latin, the word umbra, umbrae means both shadow and ghost. Is that a crazy coincidence or what?!