First of all, girls should have a slim figure, so that they will look better in clothes. Therefore, according to your situation, I suggest you reduce the excess fat on your body first, and then consider gaining muscle properly. This requires a long and unremitting process.
If you want to lose weight, I suggest you go to the gym for classes, aerobics or belly dancing. It is particularly emphasized here that the slimming effect of belly dance is still quite good. Some of my students insisted on belly dancing for three months and lost weight 15kg. For example, shaking sago can make you slim your abdomen and thighs, your hips can exercise your waist and abdomen, and some arm movements in belly dancing can also slim your arms. If you learn this, the PE teacher will teach you.
Secondly, in addition to belly dancing, you can also use the fitness equipment in the gym to help you shape yourself, such as treadmills and spinning bikes. You can reasonably arrange the duration and specific time of exercise, and it is not recommended to use it every day. You can run on the treadmill for one day, three days and five days, and turn on the bike for two days, four days and six days. The time is chosen in the free time in the evening. It is more appropriate to run on the treadmill for 20 minutes and turn on the bike for 50 minutes.
Finally, when it comes to muscle training, Monday and Thursday are arranged as follows: two dumbbell bends 15 times *3 groups, 30 sit-ups and back pull-downs 15 times *3 groups.
Arrangement on Wednesday and Saturday: chest press 15 times *3 groups of sitting shoulder press 15 times *3 groups of Roman chair lateral bending 15 times *2 groups.
Schedule on Tuesday and Friday: chest expander 10 minutes, leg bender for 20 minutes, abdominal exerciser 10 to 20 minutes.
In addition, you can arrange to play ball and swim on Sunday.