To get fresh air into the body, get up from the house early in the morning and go for a walk. If there is a garden near your house, go there and stand near the greenery or tree, draw a long breath in and leave outside. When the oxygen released from the trees goes into the body, it fills new energy in the body.
Apart from this, if you cannot go for a walk outside the house, then by standing on the yard or roof of the house, you can adopt the process of leaving a long breath in and out. If you do yoga then it will be a very good thing.
There are many postures for taking clean air in yoga in the body. If you are unable to do yoga, then go for a walk in the morning, your mind and heart will be very relaxed with the fresh air in the morning. You will have a great day too.