Constraining a player

Title says it all. I’m trying to constrain players with an elastic, but it doesn’t do anything. I tried to weld the player to a prop to which the elastic was attached, but the weld just didn’t work. Is there a way to add a working elastic/rope to a player without preventing him from moving completely?

By the way you shouldn’t weld players or else that could cause issues, but it is possible I believe