I walk everywhere, from aquatic to terrestrial environments.
That is great for your health I'm sure!  Do you enjoy being out in nature while you are walking?
I do, but it raises different problems than that in water, I get tired very easily!
Well, if you keep at it, you will build up stamina to last longer, right?
You're right, but walking, running, or jumping cause pain in my knees, sadly.
That's no good.  You should go to the doctor and get it looked at.  They may be able to do something to ease or eliminate the pain.
I probably should but I am scared of the use of chemicals that I a doctor might do.
They may be able to prescribe rehab and all natural methods or remedys.  It is worth at least looking into.
yea its worth looking into,  I really want to repair the functional structure of my leg and foot.
It will allow you to have a better quality of life and better able to do daily tasks.  You got to take care of your legs.  You only have two of them!