It is ok to go to the gym. As long as you persist, it will have an effect. Go to the treadmill for 30 minutes every day and then stretch your leg muscles to exercise your abdominal muscles. There should be aerobics and spinning classes in the gym. You should follow them. What you should prepare is a headband (because running will cause a lot of sweat to prevent sweat from flowing into your eyes), and then you should wear loose and breathable clothes. If you are a woman, you'd better buy a sports bra if you have enough budget. Other equipment is nothing, such as sweatpants and sports shoes. Take a towel or slippers for the first bath. That's about it. Stick to it and you will get something. Come on, I wish you success in adopting me yourself, and you can ask questions if you have any questions.