Well, I don't think its humanly possible to never have any stress at all. Its part of our nature as humans spanning back thousands of years as a means to protect us from perceived threats. Its the natural fight or flight response. In the modern world we're not being chased by wooly mammoths- our stressors have just evolved. But with good stress management practices we can stay on top if it.
I'll share my favorite stress management videos from Catherine Wikholm. Good luck. 🙂

Maybe you might find something you enjoy in the following collections. Best wishes! :)
Pranayama Breathing and Chair/Office Yoga https://grokker.com/cooking/collection/pranayama-chair-office-yoga/6032caad6cd106116a987af1
Meditations https://grokker.com/mind/collection/meditations/603a8adab356ab7d31b44f1e
Audio Walks and Music https://grokker.com/cooking/collection/audio-walks-and-music/6032d7d96cd106116a9885f7
Mental Self-Care https://grokker.com/cooking/collection/mental-self-care/6032c8306cd106116a9877ce
Pep Talks https://grokker.com/cooking/collection/pep-talks/6032c80d6cd106116a98776e
Nourishing Sleep https://grokker.com/fitness/collection/nourishing-sleep/602aaddcb1865576f51ac6fe
Financial Wellbeing https://grokker.com/yoga/collection/financial-wellbeing/601b6e8b1ec74f0227239076

I am not sure there is a secret however I would recommend that you check out both of these programs that you may find helpful.
https://grokker.com/mind/reduce-stress-and-anxiety/program/breaking-free-from-stress/5d781260ca675d37f1bd6c3f
https://grokker.com/yoga/gentle/program/yoga-for-stress-reduction/555e153ebe484bd521a947e5

You can also check out any one of our yoga and/or fitness programs at the following links as regular exercise can help you to relax, improve your mood, reduce stress and can also improve your sleep.
https://grokker.com/yoga/programs
https://grokker.com/fitness/programs