How can a person who is 160 KG and 180 CM tall change into a healthy person who weighs 75~80 KG? How can one plan for this? Jogging is not possible because he has a leg injury and spine problem at L3 L5. Is "jogging/walking" in swimming pool okay? Water can help support his body weight.

I do not see this question as duplicate because this person is very stubborn and has a lack of determination, normal methods of weight-loss will not likely work.