Supermodel Heidi Klum swears by his skills: "When I need to get in shape fast, I know that David's the man... with David, I know I'll get some real results."

And Heidi isn’t the only fan, actress Liv Tyler is also blown away by his expertise: "I work out with David Kirsch on a regular basis, but I really see his magic when I need to get in shape quickly for a film, event, or photo shoot.

“Within two weeks I see huge results and feel stronger, healthier and 100 percent better inside and out,” the star explains.

So here’s David’s top 10 tips to lose the pounds

Rule 1: Know your body

Before starting your diet, weigh yourself and measure your waist, hips and thighs, then record your statistics in a journal. For added inspiration, take a full-length photo of yourself in your bikini. When you’ve reached your target size, you’ll be able to see exactly how far you’ve come.

Rule 2: Ditch the scales

Don’t weigh or measure yourself at all during your two-week diet. Instead, use how tight your clothes feel to gauge your success. Oh, and all the compliments you’ll be getting!

Rule 3: Always Prepare

Give yourself a week to get ready for your no-excuses diet. Use this time to wean yourself off your bad eating habits, rather than launching yourself in at the deep end.

Rule 4: Family Support

Sit down with your friends and family and explain to them that you are about to embark on a diet. By telling people you are doing this will mean you are less likely to fall off track. But the main reasoning behind this is to gain their support. Dieting is a hard process so you will need as much help as you can get.

Rule 5: Don’t diet on Monday

NEVER begin your diet at the start of the week — psychologically and statistically it’ll mean you’re doomed to fail! Instead, pick a Thursday or Friday as your start day. Then, by the following Monday, you’ll be well on your way to seeing real changes in your body and your energy levels, too.

Rule 6: Go to bed earlier

Late nights are often the time when people snack, so make sure you’re in bed at a decent hour. Plus make sure you don’t eat after 7pm because you wont have enough time to burn off the food before you go to sleep.

Rule 7: Think positively

You need to deconstruct to reconstruct… so it’s important to keep mindful in your workouts. Make sure you follow the three core tenets of the program: sound eating, sound exercising and sound thinking.

What you think about will govern what you think about next! Believe you can succeed in this ultimate challenge to look AND feel amazing in your bikini!

Remember though that wellness isn't just about having a great body, you need to feel terrific inside and this will radiate from you!

Rule 8: Plan your meals

Organise your meals for the day and only buy the food you need — you’ll be less likely to fall off the wagon.

Rule 9: Cook in bulk

Instead of cooking different meals everyday, it’s often better to cook a lot and then you can eat it over a couple of days. Plus by taking your lunch to work you’ll be less tempted to eat a fattening lunch. So invest in some large pots and some tuppawares!

Rule 10: Eat five times a day

Eating little and often is the best way to lose weight. Here’s an example of a meal plan I’d suggest you follow each day for two weeks:

7am – BREAKFAST: A protein shake
10am – SNACK: Scrambled egg whites with spinach and mushrooms
1pm – LUNCH (MAIN MEAL): A baked salmon filet with a leafy green salad, or a portion of my legendary Turkey Chilli and salad
4pm – SNACK: Some chopped celery/red peppers
7pm – DINNER: This must be very light - perhaps my Sesame Chicken Fingers with some steamed fresh asparagus

Good luck!

For recipes see David Kirsch’s new book The Ultimate New York Body Plan (McGraw-Hill, £9.99).

Or visit www.davidkirschwellness.co.uk for further info.

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Photography: Alamy, Landmark Media