Fit as a Fiddle (max Health) and Ironheart (max Stamina) each need one stat raised all the way, 78 Inhibitors, and the base game holds only 126: not enough for both on one save. This run gets both after the credits with a save backup: with at least 81 Inhibitors unspent, back up the save, max one stat, restore the backup and max the other. So from here on keep the Inhibitors you pick up unspent, and spend only what a climb or a skill really asks for (Stamina for climbs; Health later for the Smash skill), no more than 45 in all, so 81 stay unspent. If a backup won't restore on your platform, New Game+ adds 30 more Inhibitors that can finish the second stat, with limits: only one of those 30 spots is known (section 22), the rest have to be found by searching, and every one of the 126 in this run is needed too.