The way I approach weight training is as a form of interval training. My goal is to take a weight that I can lift 10 times. Then I try to really work with that weight until I can lift it 100 times in a row quickly. I also like to use each arm separately, so that I’m working with a weight I can handle with one hand. The general understanding is that one needs one’s blood pressure under control through medications or lifestyle before you undertake weight training. I see weight training as providing both strength improvement and endurance improvement.
http://www.mayoclinic.com/health/weightlifting/AN00637
http://www.bodybuildingforyou.com/articles-submit/joe-knight/high-blood-pressure.html
http://weighttraining.about.com/b/2009/07/06/weight-training-lowers-blood-pressure-over-time-but-caution-in-the-gym-still-warranted-for-hypertensives.htm