I am making a reflex hammer. I want to make this because astronauts need to be able to check their reflexes. They need to be able to have good reflexes to work out. If they can't work out, it will hurt their bodies. While they’re on Mars, if their bodies hurt it will make them focus on the pain, and not on the mission. They are going to be kind of far away from the spaceship, and if they don't take care of it will make them slow and can't move. They need to move to do their mission or else they will fall. They will need it for all astronauts to check their reflexes. Astronauts can tap their knee and if it doesn’t make it move up immediately on its own, they will need to get it checked.