Exercises that get your heart rate up to 150 are almost always relatively strenuous exercises in which the legs act as core muscles, such as running, bobbing jumps, open and closed jumps, squat jumps, leg raises, and so on. A lot of people think these exercises hurt the knees, and I think they're overthinking it.
Knee pain after exercise is very normal, mainly because the knee ligaments and cartilage overload caused by discomfort, need to ensure that the knee joints enough rest, from the low intensity low-frequency program refining, step by step to let the knee joints to adapt to the exercise. If the legs have been injured, then choose to swim, unless it is a long-term professional training, swimming is difficult to adhere to and keep the heart rate above 150, but the impact on the knee joints than the ground exercise is much smaller.
Everyone's heart rate is different, as you get fitter the lower your heart rate is likely to be, so the less likely you are to achieve a higher heart rate, so the weaker you are the faster your heart rate is, and sometimes you can easily go up to a hundred without exercise. In atrial fibrillation it can also be two hundred, so your quest is just wrong, to be able to show that you are knowledgeable and educated and scientific fitness with this kind of digitized health you have to be really knowledgeable and educated and understand science to be able to do that.
The more the heart runs at high speed the less it works well. There is basically not much effective cardiac output when you reach atrial fibrillation. And with high heart rate soon the heart becomes diseased.
The same person in the exercise body after a period of time, the heart rate will drop, we all know that the athlete's heart rate is very slow there are more than thirty more than forty, more than fifty. The normal person is sixty to one hundred, so you first look at what state you are your physical fitness what is the situation, is weak or strong, weak others look at you your heart rate can be on one hundred, and strong through very intense exercise is not possible to reach some indicators.
Generally speaking, to reach one hundred and thirty-five on the requirements of the exercise, want to pursue the increase in heart rate, is not desirable, the number of heartbeats in a person's life is limited, so the exercise acceleration is in fact for the health of the smooth slowing down of the heart rate, so the pursuit of your is wrong, one is to over-standardize and over-exceeded the amount to achieve a state of undesirable, the second is the heart is more important than the legs, so the pursuit of your is still put the cart before the horse. The number of heartbeats is relatively fixed, so you jump more to go earlier, the more exercise the more robust heart rate will be lower. So what you're after is to achieve a certain amount of intense exercise the heart rate won't even go up much to be right. At the same time to reduce the daily heart rate to make the heart stronger.