The former Pussycat Dolls singer claims going for a morning run is her fail-safe method to find musical inspiration, as well as giving her a natural endorphin high and keeping her body in shape.
She admitted in an interview with the MailOnline's Femail: "I get my ideas for what I want to do on stage and my music when I run. I prefer doing it in the morning, first thing. Even if I just manage to squeeze in twenty minutes.
"I do Soul Cycle classes in LA and bikram yoga and then interval training 3-4 times per week. My body starts to crave the endorphins if I don't work out."
The 35-year-old star doesn't believe in depriving herself of her favourite foods - which include cheese plaits, pasta and fajitas - and simply watches her portion sizes.
Nicole rationalised: "Everyone has different body and blood types so it's best to just eat what makes you feel good. I believe that you should have everything in moderation. If I deprive myself, I want it ten folds and I'll go the opposite way."
The star, who has left 'X Factor' judging panel after two years on Simon Cowell's singing show, is busy designing her second clothing collection for Missguided.
She added: "I'm over the moon with how it turned out. It all worked out so well and was well received. I will be adding a summer collection with lots of boho inspired flowing pieces and long, colourful maxi dresses."