This question just struck me. Has there ever been any experimentation in space with bungee cords integrated into clothing to help maintain bone strength? It wouldn't be the same as gravity but all you really need to do is maintain some resistance on the bones, right? I'm thinking if every time you reach for something or stretch your legs your body is presented with resistance via strong elastic cords, it would go a long way in maintaining bone mass. This idea could even been expanded on (no pun intended) where the suits of astronauts could be tethered by long bungee cords from a points on the four walls and floor of a space cabin to simulate gravity on the whole body so, no matter where they move throughout the space ship, they encounter a constant light resistance. And of course, the bungee cords could be swapped out for different strength cords if the astronauts require more resistance. There are probably other issues to be concerned about with micro gravity but I like the idea of an inexpensive low tech solution to this. How would you personally design such a system so the cords wouldn't interfere with the astronauts activities? I imagine the cords would have to extend from a single point in the ceiling that could spin in response to the movements of the astronauts about the space cabin. But maybe just having the cords in the space suits would be enough?