Is it possible to stay in shape without exercising? If so, then how?

No, diet alone can help weight control, but exercise is critical to burning fat and boosting muscle mass.

1. 1 Buy a pedometer, or use a smartphone's pedometer app. This can tell you how much exercise you already have in your daily schedule. Doctors recommend that you take at least 10,000 steps in a day to be healthy.
   • If you do not take this many steps in a day, you will need to find ways to be more active in your daily life. If you do not, you may be at risk for weight gain, high cholesterol, high blood pressure and chronic diseases.
      
2. 2 Walk faster. If you commute, walk the dog or walk inside stores, do them faster. You will burn more calories, increase your heart rate and save time.  
3. 3 Commute by walking or biking, instead of driving in a car. If this is an option, your commute will not only take out the need to go to a gym, it can also release work-related stress and allow you to get more Vitamin D from sunlight.
   • If this is not an option, try to commute in more than 1 way. Take the bus half of the way and walk the rest of the way to work. You can also park 1⁄2 or 1 mile (0.8 or 1.6 km) away from the office, and walk to and from your car.
    
4. 4 Avoid sitting for longer than 30 minutes at a time. People who sit in a desk for hours are at risk for chronic back pain. You burn 33 percent more calories when standing, and frequent walking around will help to stretch your muscles and improve your posture.  
5. 5 Embrace twitching. Although twitching movements are sometimes frowned upon, tapping your fingers, stretching muscles, rolling your eyes, moving your neck and wrists, and frequent standing and pacing can help you to burn more calories and boost your metabolism. Move your legs or arms when you talk on the phone, watch TV or read.
   • Studies have shown a link between small muscle movements, metabolism and weight control. People who are skinny tend to incorporate more small movements into their daily life. They may not even be aware that they are doing it. Start a habit of moving your body in a way that is not likely to annoy you or others.
      
6. 6 Breathe deeply. Start a habit to relax, sit back and breathe deep into your diaphragm (chest). Inhale for 1 to 2 seconds and exhale for 2 seconds. Do this for 2 minutes at work, in the car, on the couch, while you are making dinner or before bed.  
7. 7 Do your cleaning and household chores in 30 minute to 1 hour intervals.Mopping, scrubbing, dusting, vacuuming, gardening, sweeping, window washing, car washing, raking and other chores qualify as exercise. Plan to break a sweat when you do your chores.
   • A British survey found that women said they cleaned approximately 2 and a half hours per week. This is approximately the same amount of moderate exercise that is recommended by doctors.
    
8. 8 Cultivate outdoor hobbies. Even if you hate to exercise, perhaps you like to throw a Frisbee with your dog, play baseball with your children or play basketball with friends. Incorporate socializing into your active hobbies and you are less likely to view them as exercise.  
9. 9 Get a dog or walk 1 for someone else. Dogs require walking a few times a day, and longer walks on weekends. Turn this into a chance to get out, run alongside the dog or play fetch games.
   • Getting a dog is not a matter to be taken lightly. If you already have a dog, think of ways that you can play more with it. If you cannot afford to take care of a dog, see if any neighbors need a dog walker. Many times elderly people with pets cannot take them on long walks or to dog parks to run and play games.
    
10. 10 Plan active days out. Go bowling, play tag, go bicycling, swimming, dancing, or play active video games with family or friends. Devote several nights and weekends to family or friend activities, rather than watching television or sitting at the computer.

If you do have a lot of activities per day and you have a good diet then you can maintain your body shape i suppose. But ,for sure,depends how much calories you burn and consumpt per day.

Yes,Its possible, through strict diet plan +  medicines + Food supplements

But, this is a very long process, and a slight mistake could give you a reverse results, like instead of loosing weight, you will start gaining more weight,Also, a very expensive,In order to keep your diet balance, means less bad carbs, more good carbs, proteins, vitamins and salts,A few weight reducing supplements, strict scheduled eating timingsPeople follow excercise, or weight training with diet, as it provides fast results and less expensive.I can't give you all details in hereAs before we create a nutrition chart, we have to know, person's daily routine, family background, body shape type, a complete case history in short.Suppose a person is diabetic or blood pressure type issue by birth, then diet plan would be according to that person physical conditions,Also, people has several health issues,in young age they don't trouble much, but if we put in to diet, they all appear suddenly and people got puzzled or confused,So my dear its a very long planning type thingCan't mention all in here until and unless we know all about the person.contact me, I will provide you a complete diet plan, My charges is Rs.5000/=If interested, Reply.

Be positive more than that