I designed a kite that has a rocket booster. There is an engine inside a box right inside the middle and to make it have power, it has a solar panel on each side. Astronauts fly the kite outside the spaceship. To help the astronauts stay healthy, they tie a string at the bottom, and they run with the kite. When they run, the astronauts can get more muscles.
(There is also a camera. All they have to do is turn it on and it will spy on aliens to prove that aliens are real!)