Dude, it takes at least 60 minutes to run. Spinning twice a week is enough. Don't eat staple food at night, just eat vegetables and fruits. You just want to lose weight. It's endless running. Run on an empty stomach for 60 minutes every day for 2 months. As long as you keep your mouth shut, it will definitely work. Look at your biological clock in the morning or at night. I belong to the kind of morning running, and I have no energy all day.

Choose a good pair of running shoes to protect your knees. 80 kg is not too heavy, but once the knee or calf feels uncomfortable, it is best to change the elliptical machine, which will not hurt the knee!

Run! I wish you success in losing weight