There are several technical requirements and challenges to the possibility of space jumping. These requirements would be somewhat eased when entering the atmosphere from a simple drop, where the heat of reentry would be considerably less than that of reentering from orbit. At any given density of air, the terminal velocity of a person is much lower than that of a heavy spacecraft. This is because starting from a stationary platform means that fall speed never exceeds the local terminal velocity (though this is quite high in thin atmosphere) and a small light body slows down relatively quickly as the atmosphere thickens.