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Life Upgrade #1: (PAST) After fighting the girl in black a second time, pull the large altar on ground level of the sacrificial chamber to reveal a secret door. Go through the trapped hallway and bag the first life upgrade.
Life Upgrade #2: (PAST) This is after Slow Time is earned. From the room where the Prince has a cut-scene with the maggot man creature, head back out into the large courtyard like room with a timed floor switch next to some stairs that opens a low gate at the top of the same set of stairs. Go through that trapped hallway for the second life upgrade.
Life Upgrade #3: (PAST) This is after the Serpent Sword is earned. Rotate the turnstile switch directly opposite the facing of the metal nub the Serpent Sword was used to create platforms to a door at the bottom of the chasm. Use long wall jumping to slow the Prince's descent down to the level of the door. Past that door is a trapped hallway that leads to life upgrade #3.
Life Upgrade #4: (PAST) When exploring the Garden Tower, look for a room that is overgrown with vegatation and is right below a box and folding bridge puzzle (it is in the same vicinity as the first switch that turns on the water for the Garden Tower). A break in the fencing allows the Prince to drop off and use ledges to access a door underneath the overgrown vegetation room. The fourth life upgrade is past that trapped hallway.
Life Upgrade #5: (PAST) When exploring the Clock Tower, look the giant golem enemy that throws explosives. One breakable wall is a save point, but there is a second breakable wall on the other end of the room leading to the life upgrade.
Life Upgrade #6: (PAST) After gaining the Scorpion Sword and a particularly tough giant golem encounter, a ladder leads the Prince to a Roman courtyard room; two breakable walls are here -- one has a switch, the other has the door which requires slow time to access. The life upgrade is past that door
If you guys find more Health Upgrades in the game. Please post them here.