There are so many ways to keep our body fit and healthy without going to the gym. In fact you don't need to, a combination of balance diet and a simple exercise like running or fast walk is more than enough to achieve a healthy body.
When it comes to food, I recommend a high protein diet like lean white meat that is coupled with green leafy vegetables is highly advisable.
Now, the next thing that you need to consistently do everyday is "High Intensive exercise", which is a type of routine that will require at least 7mins of your time. Basically you need to do a simple exercise like jumping jacks, jump rope, jog in place and so on - but it has to be done in an extreme speed that you can't even normally keep up.
This won't make you super-fit and it won't even slim you down drastically but it will keep you healthy for sure😊 good luck!
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