Whom does he train? Naomi Campbell, Natalie Imbruglia, ex-Spice Girl Mel C, fashion designer John Galliano.
What does he promise? Not just weight-loss but long-lasting, "changes to the complete person".
What are his secrets? Changing your workouts and the type of exercise you are doing regularly will achieve the greatest results because your body will be constantly challenged. Male or female, aim to build some muscle through strength training as this will help to burn calories on a daily basis. Exercise three times per week for a minimum of 35 minutes. Never skip breakfast and always chew your food thoroughly (you'll satisfy your appetite with less food and improve digestion). Drink a minimum of one litre of water daily and avoid caffeinated, sugary and fizzy drinks
Best suited to: anyone who likes to take a more serious approach to shaping up.
What would he usually cost? £80 for a one-hour session with Matt, or £55 for an hour with one of his trainers at his gym, Matt Roberts Personal Training in Jermyn Street, SW1. Call 020 7439 8800 for bookings. Roberts also teaches at the prestigious Le St Gèran hotel in Mauritius.
On the cheap? Try the Matt Roberts Home Gym, £44.99, which includes an exercise manual, blow-up fitness ball and two "resistance" tubes, or buy his international best seller, Matt Roberts' 90 Day Fitness Plan book, £9.99 (Dorling Kindersley) or The Fat Loss Plan DVD, £16.99 and video, £12.99 (Universal).