Bet Me by Jennifer Crusie is FABULOUS and perfectly fits your description.

He Loves Lucy has an overweight heroine and a hunky trainer. Lori Foster has at least 2 - Too Much Temptation and another can't remember the title Never too Much I think is the name

eta: someone suggested The Perfect Wife and I have it onmy tbr but haven't read it yet..think it's by Lynsay Sands and is historical. adn I think Susan Donovan wrote He L oves Lucy.

He Loves Lucy is good but the plot surround the heroine getting thin.

There was another discussion on this here not too long ago.  I suggest doing a forum search for the topic; there were a number of good recommendations in it.

In fictiondb.com, I've tagged all the BBW (Big, Beautiful Woman) stories that I've read... Some are parts of series, others are standalone stories.

SERIES: SD = Silhouette Desire, SIM = Silhouette Intimate Moments, SR = Silhouette Romance, SSE = Silhouette Special Edition, HBZ = Harlequin Blaze, HT = Harlequin Temptation.

SUBGENRE: CR = Contemporary Romance, ER = Erotic Romance, RR = Regency Romance, RS = Romantic Suspense, WR = Western Romance (historical)

My top recommendations are in BOLD CAPS

I can't say enough good things about DARING IN THE DARK by Jennifer LaBrecque. This is a funny story and our British hero sings praises about her plush derriere. An excellent afternoon's read! If you're not in a giggly mood, CAMERON will have you in tears, but it's a must read also.

Colleen

I haven't read this yet but I started it in the book store and couldn't help but buy it: heroine is plus sized.

Dare to Surrender
Author: Lilli Feisty

I didn't think the woman in He Loves Lucy stayed thin though..can't remember..I remember her job was gonna document someone losing weight and her boss picked her but I thought it was just for the show. I vaguely remember much of that part but remember the romance a little better. I did like Bet Me though it was c ute!

Lori Foster has at least 2 - Too Much Temptation and another can't remember the title Never too Much I think is the name

Too Much Temptation is the story that contains the BBW heroine. Never Too Much is the sequel that deals with TMT's hero's brother, but doesn't have the BBW storyline. Both really good books, but TMT was a keeper for me. :)

Here is the link from All About Romance where you can get an entire list of BBW heroines.

http://www.likesbooks.com/curvy.html

These aren't romance but Kathryn Lilley has a cozy series about a plus size reporter.  She usually has a hot guy interested in her.

Cathie  Linz has a book called Big Girls don't cry.  The heroine is a former plus sized model. 

I'm on the phone with my best friend and she mentioned a plus-size heroine book she enjoyed -

http://www.paperbackswap.com/book/details/9780373822386-Just+Desserts

We weren't talking about the boards here, but she was skimming through something at fantasticfiction and the Browning title caught her eye. I'm not even sure if I have it or not, but it does sound good.

Gail

Definitely BeT ME by Jennifer Crusie, It is my favorite book period.  It is absolutely funny.

Older Karen Robards book Night Magic has a plumpish, sedentary girly romance writer who is mistaken by the KGB (80's Cold War era anyone?!:LOL:)  for a spy type due to a dedication in her latest book to her cat and is "rescued" by a burnout spy.   Then they're on the run w/ the cat and his allergies and her non athletic self.  Hot romance but funny too.  One of my keepers that has recently been reissued without the cheesy pink cover, pity that

link to the 2009 edition available here:)

http://www.paperbackswap.com/book/details/269998-NIGHT+MAGIC

and the others:

http://www.paperbackswap.com/book/browser.php?s_type=a&k=&ti=Night+Magic&a=Karen+Robards&g1=&b%5B%5D=Paperback&b%5B%5D=Hardcover&b%5B%5D=Audio+CD&b%5B%5D=Audio+Cassette&pd_type=e&pd=&r=n&sby=publish&oby=DESC&ts=&saved_name=

If you like paranormal, the whole "Real Vampires....." series by Gerry Bartlett is about a full-figured vampire who claims she was "just bloated" when she was turned, haha. My kind of girl. The first in the series is Real Vampires have Curves.

Fools Rush In by Kristan Higgins and Bet Me by Jennifer Cruise. Both are great, enjoyable reads!!!

Simple Need by Lissa Matthews.  Short erotica.  She's definitely a Size 16 or better.

Eye of the Beholder by Ruth Ann Nordin is my absolute favorite of this kind of romance.  It is a realistic story of a woman who agrees to be a mail order bride when she realizes that her life back East will be as a spinster living with her parents when all her brothers and sisters have found mates.   She is spurned by the man who "orders" her because he doesn't consider her beautiful enough.  But another man sees her beauty and she becomes his wife.   I really loved this story.  One of the few Christian romances with a realistic sex and marriage story.

Bet Me by Jennifer Crusie