You can do some indoor sports on rainy days.
The first thing to do in indoor sports is to run on a treadmill. Treadmill can not only help you record the calories and distance you consume, but also running is basically a whole-body exercise, which is simple, fast and convenient, but treadmill is more expensive.
Use abdominal yoga mat for exercise. We exercise most of the time to thin our stomachs, so the abdominal wheel is a very good tool. Yoga mat is mainly to make our knees less injured. The author lost five pounds a month with her abdominal wheel.
Use soft ball, it will be better if you use soft ball with gymnastics in some sports. Duoyan Zheng gymnastics has such a set of exercises. If you insist on doing it, I believe the effect will not be bad. The key is to persist. If you give up halfway, the effect is not great.
Use dumbbells for exercise. Dumbbell exercise is also relatively simple, but it can exercise the strength of your hands and waist at the same time.