First, is the most obvious: an increase in energy. This is the incentive that you need to keep going and eventually work up to increasing your workout intensity. As your energy increases, that is the incentive to keep pushing on.
Weight loss also has the benefit of making blood sugar control much easier. Many Type 2 diabetics have been able to decrease their medication and, in some cases, even come off of it entirely by trimming down and eating healthily. This is not only an incentive psychologically, but financially, as some of these medications can be quite expensive. It certainly is a goal to strive for.
Weight loss is good for the other systems of your body, as well. Your heart and the entire cardiopulmonary system will revel in less fat, which is automatically accompanied by increased endurance and strength. Your respiratory system gets a boost too, by giving you more oxygen to your brain and throughout your whole body. This is not only good news for your tissue and organs, but blood vessels also reap the rewards.
It should be noted that anytime you are ready to start an exercise regimen, you should always be advised by your doctor and a registered dietitian. Your doctor can advise you on the medical scenarios that can occur, while the dietitian is trained to know what will work best for your particular case and what you can do to get started. A good exercise program is more effective if you go about it the right way, armed with accurate information. You want to avoid muscle wasting (sarcopenia), which occurs when you lose weight too fast or in any unhealthy manner. Less muscle results in a slowed metabolism and a tendency to regain weight more rapidly. And usually the weight regained is a higher percentage of fat than before.