Setting herself a goal of a Catherine Zeta-Jones-esque figure by June 30, Tanya is well on her way... providing she can stay away from American delicacies.
My time in New York just kept getting better.
One of the highlights was dinner at "Gordon Ramsay at The London".
Quite simply one of the most heavenly dining experiences of my lifetime.
I'd been told to go to Grimaldi's pizzeria in the shadow of the Brooklyn Bridge - the pizza was superb and the experience one to remember.
I convinced myself that eating at Gordon's and the pizzeria could be justified given the two hours-plus walking every day and the slog on the exercise bike. Perhaps deluding myself?
Of course, no trip to the Big Apple is complete without Broadway, so I headed to the theatre. This also provided an opportunity for a burst of exercise.
I made it to the half-price ticket office in Times Square at 7.50pm to grab a ticket for an 8pm performance.
The guy sold me a ticket, directed me to the theatre and ordered me to run before yelling "watch the traffic" as I charged like a stampeding buffalo in the direction of the theatre.
I made it in the nick of time to see The House of Blue Leaves.
We also went to see the Frick Collection - an art collection that reminded me I would have been a supermodel had I been around several centuries ago.
Sunday morning was our last day in New York, so my friend Tamara and I were up early to enjoy the quintessential New York bagel.
My colleague, Elliot Goldman, had given me advice on where to go.
I was also all kitted up in my running gear for a run through Central Park after breakfast.
In a delirious moment of madness I decided to leave Tamara in the dust and run to the bagel place.
How the hell I managed to run through the streets of Manhattan on a Sunday morning without coffee is still a mystery to me - I would go as far as to say I enjoyed it.
There are plenty of things to look at in between remembering to breathe.
Tamara caught up with me at the deli and I have to say, a lox and cream cheese bagel has never tasted so good.
Then it was off to Central Park to run through the park with squirrels, raccoons and annoying roller bladers to keep me company.
Before leaving New York and feeling I had run my own marathon I decided I deserved to indulge in Junior's Cheesecake, labelled New York's best cheesecake by New York Magazine.
How could I resist?
It all seemed such a good idea at the time.
Afterwards I was full of remorse, further exacerbated by Tamara finding out via iPhone that it contained 390 calories.
The words of Richie Lambert about the impossibility of out-training bad food choices haunted me all the way to Las Vegas.
We arrived three hours late after a diversion to Denver because of fuel shortages ... The delay gave me the chance to feel immense guilt on the cheesecake front.
Vegas is tacky and totally over the top.
We stayed at the Venetian, a mock Venice complete with St Mark's Square and gondolas. Still, it is undoubtedly the most opulent hotel I've ever stayed at and just walking around the hotel complex is good exercise.
There are a lot of women who look like they were manufactured at the Barbie factory and others who look like they left the house half-dressed.
Then there's the large-scale gambling.
It's pretty surreal to trudge to the gym at 9am and see people hitting the pokie machines and blackjack tables at that time of the day.
The gym was a very up-market affair, but the bike and the cross trainer were there to welcome me. Overall, I found Vegas a tad depressing.
I'm now in San Francisco and loving it.
There's no gym at the hotel, but the city is a gym in itself with steep hills everywhere.
There are also tempting restaurants to resist but, knowing in a few days I'll be checking in with Funktional Fitness, I'm being good.
I even bought a packet of sunflower seeds yesterday ... It goes on record as one of the saddest things I've ever done on a holiday.
Still, here in San Francisco I have excellent coffee and a leisurely stroll across the Golden Gate Bridge before I head back to the gym in Queenstown.
I'm not looking forward to getting on the scales.
Dream holidays and fitness challenges are never going to be best friends.
