You only jumped for 4 days, and the deviation is only about 1 kg, which basically belongs to the fluctuation range. Weight itself will fluctuate, unless you are sure that you are in the same physical state (whether to drink water or not) and use the same measuring tool. Even so, it is normal to have a fluctuation of around 1 kg.

About 45 minutes of aerobic exercise every day, including stretching, is definitely not too much. The National College of Sports Medicine recommends 50-60 minutes of fat loss every exercise, which does not include warm-up and relaxation time.

Just put a hundred hearts at ease. It will never be a muscle. If it was so easy to grow muscles, there wouldn't be a group of people desperately lifting iron blocks in the gym.

If there is relaxation in the back, there is no need to do more.

You are absolutely right to choose this sport as your sports goal. Aerobics has a better effect on overall shaping than jogging.

Exercise fat reduction is a systemic fat reduction, which can definitely be reduced. Don't worry.

Finally, you'd better change a software for managing calorie intake on your mobile phone or computer to manage your daily calorie intake. As long as your daily intake does not exceed your normal needs. You will lose body fat very healthily.