Struggling to keep your New Year's resolutions? Here's how to keep yourself on track

Why do millions make New Year's resolutions knowing the odds of them ever following through with them are minimal? Fitness expert Jasper Rook Williams has some advice.

LONDON -- It is one thing to make a New Year's resolution. It is, however, a very different thing to be able to keep it.

Every year they are made with the best of intentions -- with the hope and desire to become a better version of ourselves -- so why is it that millions of people make New Year's resolutions knowing the odds of them ever following through with them are minimal?

Jasper Rook Williams -- fitness expert, online coach and owner of JRW Fitness -- has made a successful career so far working with hundreds of clients around the world on improving their nutrition, training and lifestyle calibration. He has a good idea why.

"The goals, if sometimes a little ambitious, are rarely the problem and they are all set with best intentions," Rook Williams tells ABC News. "The issue is there's rarely enough thought put into the approach. People have high ambitions hinging on mostly unrealistic and unsustainable methods. Rather than just thinking 'I'll eat salads and join a gym', people need to prioritize achievable routines, sustainability and lifestyle changes from a broader and more holistic perspective."

According to research, Rook Williams isn't wrong. The failure rate for New Year's resolutions is said to be an estimated 80% with most people losing their resolve and motivation just weeks later in mid-February, according to U.S News and World Report.