About fitness and weight gain ~ ask for guidance
You can pass the basic running training first. Running can promote almost all muscle movements and enhance your physique and endurance. Because you are a female friend, a lot of mechanical strength training can be omitted. Do some simple sit-ups and dance. I think it's enough to buy a treadmill at home if you want to increase your physique and keep fit. If you want to go to the gym, I want you to learn yoga. Thank you. I hope you can find the answer.