She holds Fitness For Industry, ACE (American Council of Exercise) and Focus Training advanced certificates and is an accredited YMCA Personal Trainer. Her clients have included Andy Gray; Robbie Williams; Mel C; All Saints Nicki & Natalie Appleton, Melanie Blatt and Shaznay Lewis; Alison Moyet, Denise Van Outen and Gail Porter.

Having qualified first as a dental nurse and then hygienist, Nicki commenced personal training in 1988 and formed her own company - Physical Attraction - in 1990. She was responsible for instigating personal training in the David Lloyd Health Clubs and was in charge of setting up and managing all gyms across the group until the Whitbread takeover, shortly after which she chose to leave to pursue her interests in the media.

She contributes on a regular basis to a wide range of journals including Health And Fitness Monthly, Womans Own, Top Sante, Zest, Shape, Cosmopolitan, Marie Claire, Red, Now, Closer, Slimming and Harpers & Queen.

In addition to numerous appearances on GMTV, she was fitness presenter for Livetime on Granada Breeze from 1999 - 2001 and contributes frequently to programmes on Discovery Health. She is author of three other books - Fight Fat, Fight Fatigue; Energy Makeover and The Work Book - all published by Harper Collins for Sun Books. In 1999, Carlton Video released Nicki Waterman Your Personal Trainer which has sold in excess of 100,000 copies to date and she is co-presenter of the Telstar/GMTV Inch Loss Island Video (2002). Her latest, ground-breaking DVD was released in January 2005.