Here is a pet peeve of mine since I used to weight 400 pounds is how trainers train super heavy people.  First, when you are heavy you should not be lifting the weights you should be doing nothing but cardio here is how I lost weight.  Get your self an 80-pound heavy bag and some boxing glove and hand wraps, get your self a boxing timer and start doing as many rounds as you can do in a workout session.   Since you are heavy you can’t run it will mess up your knees.  Next stop eating bread and drinking soda stop eating out and learn to cook no more salt get low sodium Mrs. Dash.  Don’t eat the big three meals a day eat 5 small meals a day about every two hours or show drink water.  Do this and in six months you will be shocked at how much weight you lost.