Challenge on!

It’s 87 degrees, and I am on my 14th lap around a high school track.

Whose idea was this?

Image may contain Human Person Patient Lauren Graham and Heel

I’d wanted a fitness challenge.

I’ve always been athletic, but I was in a slump.

What could I do if I pushed past my limits?

Image may contain Human Person Patient Lauren Graham and Heel

Could I get leaner?

Good news: They loved the idea and said they had the perfect trainer for me.

So I wasn’t expecting anything revolutionary.

Image may contain Lauren Graham Clothing Apparel Human Female Person Dress Woman Sleeve Blouse and Pants

I was in for a surprise.

Michelle Lovitt is inspiringly fit and educated in how the body responds to exercise.

A few sessions with her and I started using words like glycogen.

Image may contain Human Person Standing Lauren Graham Pants Clothing Apparel Blonde Teen Kid and Child

(Don’t get me started on fast-twitch muscles.

I’m saving that forLetterman!)

Michelletaught me to use a heart-rate monitorto be sure I’m exercising in my fat-burning range.

This image may contain Human Person Lauren Graham Female Woman and Heel

My goal is to burn 3,500 calories a week, which equals 1 pound of body fat.

She claims I’ll notice a difference in five weeks.

My muscles are sore.

Image may contain Lauren Graham Pants Clothing Apparel Human Person Heel Female Denim Jeans and Sitting

And mystomachseems to be flattening!

Left: Graham with Lovitt at SELF’s shoot.

Unfortunately, my dear friends Bagel and Cream Cheese live here, too.

This image may contain Human Person Fashion Premiere Lauren Graham Clothing Apparel Robe Gown and Evening Dress

Isn’t a diva a singer who throws things at assistants?

I think she means to tell yourself you’re worth it.

You’ll feel dumb, but you won’t be sorry.

Image may contain Lauren Graham Human Person Premiere Fashion Red Carpet and Red Carpet Premiere

Weeks 3 and 4

I travel to Minnesota, then D.C., to see family.

It’s so humid that running is a water sport.

I now go longer andburn more calories.

But I feel puffy.

“You’re in insane heat.

Drink morewater,” she says.

“I only like water when it tastes like amargarita,” I whine.

Apparently, dehydration can sometimes lead to bloating, so drinking helps.

I try flavored waters.

I was leaner, which made posing in only a men’s shirt seem like a grand idea.

I think that’s what getting in touch with your Inner Diva Warrior really means.

Lauren Graham’s Weight-Loss Weapon and Get-Sexy Moves