Now that you got the first part done..
*makes three clones*
have them go pick up us some stretchers, we're gonna need them later.
Now that you have raised you endurance a bit more, we can move on to actually opening the gates.
As I can assume, you know how to open the first four gates. Otherwise, you are an extremely talented person to open the 5th gate without learning the first 4 xd As I said earlier, the fifth gate is located on the abdomen. To open this one you have to open the first four, then focus pressure on your abdomens until you feel the point where it feels like there is some resistance. Then, apply more pressure there. Don't apply to much there or you might kill yourself. Apply too little and nothing will happen at all.