First of all, I can tell you for sure that the heart rate of 170 jogging is definitely high (ask what your running pace or speed is at this heart rate). The best heart rate for fat reduction is 180- age (maximum aerobic heart rate), and the fat reduction interval is 10 at this heart rate. For example, if you are 30 years old, then your heart rate in the fat burning zone is between 140 and 150. Try to control the heart rate of exercise within this range. At first, the speed will be very slow. Not too slow. Everything has a process. Especially: warm-up before exercise and stretching after exercise, don't skip these two links. Especially in winter, we should warm up well. Running legs are thick because they can't stretch well after running or have nothing to do with this link, so they don't relax. Your heart rate is getting higher and higher, which means that you have not rested well and your body has not recovered. Maybe you think you are in good shape and spirit. A higher heart rate means that your body reaction tells you that I need to rest, so pay special attention.

Pay attention to rest and diet during the process (it makes sense to keep your mouth shut and open your legs), don't be too eager for success, and arrange your time reasonably. Finally, I wish you success in reducing fat-healthy, scientific and happy to enjoy exercise!