Isometric hand grips can reduce BP
30th April 2013
Aerobic exercise and strength training also achieved results, as did behavioural therapies such as biofeedback (including cognitive behavioural therapy) and transcendental meditation, although to a lesser degree.

Device-guided slow breathing (such as a belt around the thorax which generates musical tones) proved effective when performed for 15-minute sessions three to four times a week.
But four weeks of isometric hand grip exercises resulted in some of the most impressive improvements, with a 10% drop in systolic and diastolic blood pressure.