Crunches next

"Okay, now the most important thing for a girl like you." Vanessa said. "Crunches."

"Time to work off those jellyrolls!" Britney laughed playfully, and pinched at Lauren's stomach, catching an embarrassing grip of flab. Lauren flinched and backed away as Britney laughed.

"She's like the Pillsbury doughboy!" She said.

Now Lauren, lay down and let's get started." Vanessa grabbed Lauren by the shoulder and guided her downwards. Lauren awkwardly bent to the ground, trying desperately to keep her crotch hidden. She flopped on her bare backside. Vanessa used a hand on her shoulder to lower her onto her back. Staring up at the other three, Lauren felt more vunerable then ever. She wedged her thighs together tightly and cupped her hands over her womanhood.

"You can't do sit-ups with your hands like that!" Vanessa said, brushing her hands away. "Hands on your head."

Lauren blushed bright red. She looked down. Her lips were hidden by her thick thighs, but enough of the area directly above them showed that it was clear she was completely hairless down there. She grimaced, seeing Mark gave curiously between her thighs. She clenched her knees together as hard as she could.

"Alright, give us twenty to start." Vanessa said. She sat and held Laruen's bare feet. Lauren was a embarrassed by the view this must give her sister, but at least it wasn't Britney or Mark down there!

Lauren put her arms behind her head. This had the added effect of flattening her bra clad chest even more. She grimaced, they raised herself up. Vanessa watched in amusement as Lauren's stomach folded, becoming lined with rolls as she scrunched upwards.

Lauren puffed, struggling desperately. The sit ups were made all the harder by her bloated stomach. She wished she hadn't been pressured into eating pizza, a milkshake and pie today! It was quite difficult to fold her small belly in half. She groaned, doing a second sit up.

By the time she'd done five, Lauren was puffing and pouring sweat.

"Out of breath already?" Britney said.

"It's the way she's doing it, with her thighs wedged together like that." Vanessa pointed out. "Here, this will make it easier.

Before Lauren could object Vanessa began prying her feet apart...