The first tip that I recommend you to do is to create a vision board. A vision board is basically just a big board with pictures on it that you can hang in any place where you will see it often. Put pictures on the vision board from the Internet that highly motivates you. These can be pictures of healthy food, people exercising, or even movie stars that you wish to look like. A vision board works wonders because it follows something called the law of attraction. The law of attraction simply states that you will achieve and attract the things in your life that you focus on the most. For example if you focus and look at a picture of healthy food, then you will start to make more conscious choices about eating healthier foods.
The next tip is really crucial as well and that is to be around and make friends with other people that like to workout as well. It has been said that you are who your friends are and this is very true. If you hang around people who are lazy and have not exercised in years, then those friends will not be very motivating to make you want to workout. If you hang around people who are in better shape than you, then you will always be pushing yourself to reach the level that your friends are at.
The final thing that you can do to stay motivated and focused is to write down your goals. Simply thinking, "I want to lose weight" is not good enough. By writing down your fitness goals, you make them real and you will hold yourself accountable if you do not achieve them. It is also very important to set a date on your goals. This way you know when you have to achieve it, and it won't be something that you eventually get done. A good example of a goal would be, "I weigh 150 pounds by September 1." This way you are writing the goal as if it has already happened and you have the deadline as well. If you don't achieve the goal by the set date, then just set a new date to achieve the goal by. Also there is no such thing as having too many goals so write down your goals today!
source : How to Stay Motivated and Achieve Your Fitness Goals