What is a good exercise program to create in order to gain weight?

Resistance/protein: Weight traning is the best way to gain muscle. Muscle is more dese than fat, so you might lose inches, but gain weight. Eat protein (an amount the size of one fist once a day and two fists once a day, three fists total) start lifting weights taht are 25% of your body weight every other day and increase 10% every 3 weeks. 6-9 reps per lift.

High intensity: Put olive oil or butter or coconut oil on everything you eat. These healthy fats provide needed building blocks for your hormones but will not cause blood sugar problems or other metabolic problems. Resistance training at % 70 max lift. You want to be able to do between 8-14 reps - do your sets to failure. High intensity is more effective & less damaging than high volume training. Get sleep & sun.