In a hot tub, as the water comes through the pipes, it has a degree of force. This force is caused by the action of the pump, which puts energy into the circulating system and forces the water through the pipes. When the pump is off, there still may be water in the pipes, but there is no force. The degree of force in the system when the pump is on can be gauged in several ways, such as by putting your hand in front of a “jet.” Another way would be to have a device to measure the amount of force that the water exerts against the walls of the pipes as it circulates. Such a device might yield a numerical measurement of the force, or pressure, of the water within the pipes.
If you’re not a fan of skim milk, yogurt could be a great alternative to fulfill your dairy needs and help fight/lower high blood pressure. According to the American Heart Association, women who ate five or more servings of yogurt a week experienced a 20 percent reduction in their risk for developing high blood pressure. Dairy also contains calcium which is essential for healthy blood pressure since the mineral helps blood vessels tighten and relax when necessary, per Harvard Medical School.
Unlike the smooth action of the hot tub pump, the human heart expands and contracts mightily each second or so, causing your blood pressure to be comparatively high one moment, and comparatively low in the next. That is why we need two measurements when checking your blood pressure: one at the moment when the pressure is highest (your systolic blood pressure), and one a moment later, when the pressure is lowest (your diastolic blood pressure).

Pickering TG, et al. Recommendations for blood pressure measurement in humans and experimental animals: Part 1: blood pressure measurement in humans: a statement for professionals from the Subcommittee of Professional and Public Education of the American Heart Association Council on High Blood Pressure Research. Hypertension. 2005 Jan;45(1):142-61.
Eat beets: Rich in vitamins and minerals, this root vegetable can help decrease blood pressure. A 2010 study in hypertension found that drinking only 250ml of juice was needed have a positive effect on blood pressure. Many of the participants saw lowered blood pressure within 24 hours. Another study from 2012 saw that beetroot juice helped lower systolic blood pressure.