The wheels are spinning at the Jewish Community Center in Dallas..

"Dig a little deeper," Spin instructor Ben Williams chirped to encourage the class. "Go a little harder."

Williams pushed the class hard but when it comes to their Thanksgiving dinner plans he gets softer.

He encourages them to dig in.

"Tomorrow is turkey day, come completely unhinged at the dinner table baby," Williams said. "Get completely unhinged."

The message comes with a side-order of common sense. The unhinged message is only for those who currently exercise and have healthy diets.

"If you've worked hard all year long and you've watched what you've eaten throughout the year it doesn't matter where you started you know everyday that you've gone to the gym those are your small victories and those small victories need to be or should be rewarded," Williams said.

Student Jill Sedacca said she'll take his advice.

"When you're working out all the time you don't feel as guilty eating what you want to because you know you're going to go to the gym and you're going to work it off the next day and the next day and the next day." Jill said.

Jill is right about the next day and the next day part--Janalou Phelan is a registered dietician at Texas Health Dallas and said many people make the same common mistake about their Thanksgiving meal.

"People think that sometimes a 30- minute walk around the block is going to do it," Phelan said. "And while that's good and we encourage that it's hardly going to scratch the surface of the extra calories that you're going to eat in that meal."

And how many calories is Phelan talking about?

"An average of about 3,500 calories is what you're Thanksgiving meal will be from appetizers, drinks, the meal itself plus deserts," Phelan added. "That's going through the line once."

Which means Jill will have to go to spin class 7 times and burn 500 calories an hour--but you know what?

She feels she earned it.

"You remember all the working out that you've done and every step you've taken when you're taking those bites," Jill said.