Hi, Denise.
I read your letter and now will help you.
If you want to feel healthy, the most important that you can do is going to sleep as soon as you can, eating more green food and walking outside a lot. But doing exercises is very well too, you're right! So do you want my advice? Of course, if you have a chance to join a gym or a fitness club - go ahead! It's expensive but effectively. I think that 3/4 hours a week will be very good. Often I don't have any time (or money) for visiting a gym and then I create something own. It's not necessary to work hard to get fit. What do I do? When no one is home I turn fiery music and dance like a crazy :) Believe me, few minutes - and you will feel yourself tired, winded but healthy. Add some physical exercises (like squatting, wringing, jumping) and my congratulations - now you're superman! Just kidding. Do it as often as you can. (For example, I do it almost every day).
So, I hope I helped you!
Good luck!
Your friend
(Все же проверь на ошибки ибо писала по-быстрому)