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You can do it yourself without a machine.The exercises definitely bring the blood pressure to normal(from high or low).
You need to help your body to build up your immune system.The breathing exercises - pranayam is a holistic approach creating extra oxygen supply in the body and will slowly help with the health problem.Do the pranayam to see the benefits.Build up your timing slowly and after two weeks at the suggested duration you will start to notice benefits.

Bhastrika - Take a long deep breath into the lungs(chest not tummy) via the nose and then completely breathe out through the nose.Duration upto 5 minutes.

Kapalbhati -(Do it before eating) Push air forcefully out through the nose about once per second. Stomach will itself go in(contract in). The breathing in(through the nose) will happen automatically. Establish a rhythm and do for upto 30 minutes twice a day.(Max 60 min/day) Not for pregnant women. Seriously ill people do it gently.

Anulom Vilom - Deep Breath-in through left nostril keeping right nostril closed
then - Breath-out through right nostril keeping left nostril closed
then -Deep Breath-in through right nostril keeping left nostril closed
then - Breath-out through left nostril keeping right nostril closed
and repeat this cycle for upto 30 minutes twice a day(maximum 60 min/day).

Bhramri Pranayam -Close eyes. Close ears with thumb, index finger on forehead, and rest three fingers on base of nose touching eyes. Breathe in through nose. And now breathe out through nose while humming like a bee.
Duration : 5 to 10 times
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Only by doing you will benefit and will feel good that you can do something to help the body.Copy and print this to master the technique.This is simplified pranayam for everyone and you do not have to go to classes to learn. This is for life unlike short term classes where you do it in the class then stop when classes are over.