I believe the answer is: Eat a well-balanced diet to increase energy and immunity
Even though physical activities improve both our energy and immunity in the long run, they are not as significant as maintaining well balanced diet in your life.
You need to make sure that you get your nutrients from various source of non-processed food in order to fulfill both your macronutrients and micronutrients.
Answer:
it causes lungs to blacken and rot and over time you will slowly die and breathing get worse
Explanation:
Do daily challenges such as doing as many pushups as you can one day and the next moving on to how many squats, in this day in age you can find many apps to work out at home with no equipment and for free.
Step 5 is what I would say sorry if that did not answer you question