If you decide to work on your body, but you don’t have opportunity to go to the gym (for different reasons), you can fix your diet and do some simple exercises. For example, you can ride a bicycle every morning. Your legs will become strong and slim. For the body, it is better to do exercises every morning. You can find a lot of videos on YouTube, which will help you to do everything correctly.
Also you need some sports stuff, like clothes, a mat and elastic bands.
Find your inspiration and ideal body shape, set it as a goal and do everything to make this goal happen.