While it's impossible to lead a completely stress-free life, finding ways to unwind and “chill out” are key to retaining your energy levels and ultimately your sanity when you have a demaning job.
There are as many techniques to decompress as there are human beings; but when it comes to finding inner calm, practices such as mindfulness, meditation and meditation are usually top of mind. Although these are great tools they don't appeal to everyone. Personally I love both yoga and adult colouring books. But what can you do it none of these apeal.
My golden rule is any activity that is enjoyable and absorbs you to the extent that you aren't aware of the time and you stop thinking about work helps you unwind and chill out. So you can choose any activity that helps you distracting your mind from everyday pressures and you love. Once you have choose your activity do it often, and put it in your diary and don't feel guilty - we all need time out.
One free, easy activity is just going for a stroll. I don't mean walking fast to hit your 10,00 steps per day target. Just go for a stroll for the sake of it.