I worked with a guy who as 5’9” and 320 lbs. We started going to the gym and walking 30 minutes each day right after work. He lost 30 lbs in the first 45 days without changing any other habit in his life.
We started adding weights and eventually he started jogging again. By the time we parted ways, he was down to 250 lbs and looked great (his weight as a linebacker in college).
I’ve done some tough jobs where I was down to the last hole on my 36” belt. Any regular exercise will do that.