It's good that ur height is 5'9"

No exercises can reduce your height by 3-4 inches

You are lucky to have such a good height. Be thankful to almighty for it. Be confident, and live a  normal.life People long for it.

Absolutely normal height, no need to change normal biomechanics of body, height could be reduced to some extent with a risk of necrosis and amputation of limb by Ilazarove technique upto 1 inch in leg and 1-2 inch in thigh bone , Naturally your height should reduce over period of time as you age gradually , spinal height is reduced by upto 2 inches

Not possible

Consult me search browse on goggle practo website Dr Rajinder sharma senior Orthopaedic neurospine joint Replace surgeon ,42 years expertise chandigarh health Department Govt Multispeciality Hospital retired Chandigarh(U.T)

No excercises can decrease the height. Once height is reached that means new bone has already formed and it is impossible to reduce it with exercises