I am going to go on record as saying my belief is that the two best exercises for blood pressure are the standing barbell press, and the deadlift. There is considerable evidence that weight training is good for blood pressure, but what I think makes these two particularly useful is that they require full body activation, and presumably push momentary blood pressure through the roof. What I think happens is that the arteries expand and flex in response. This is the whole problem with blood pressure: hardening of the arteries. But if you ramp up the pressure periodically, I think, you force them to adapt.
I am not a doctor, and can’t say this approach is safe for everyone, but I dropped my scores about 20 points on both measures in a month once I started weight training again.
The EmWave2 is likely good too. I do it every morning, and can lower my pulse about 5 bpm, and get very relaxed in a very cardiovascular specific way.