Because you run out of stamina pretty quickly wihtout flying most of the times, this strategy is pretty useful for the glitchless category. To do this, simply go into the menu and click on new game. This will reset health, stamina but also your stat points. Simply exit the menu and you'll have max health/stamina but 0 skill points spent (If you quickload on the new game panel, this doesn't happen). In my opinion this is only useful for getting stamina, because you seem to have plenty of health throughout the game, but it could be used as a backup if you don't have any medkits. Any% has no good use for this, as current runs have stamina at all points