text: Protein will help build muscle, if you want to go natural ginsing and hard work will build endurance.  There are many diffrent types of ginsing out there, so you kind the best for you.  If you are in the military, (God bless you), then you know how to run, which is the best way to build the endurance your looking for.  Due to the fact that your body is put through...discomfort, but yet you still have to push on.  that is my suggestion, and please stay safe.