With two weeks to go until Kirstie Alley makes her Dancing With the Stars debut, dance pro Maksim Chmerkovskiy is putting the 60-year-old Fat Actress star to work.

"It's really hard. You're twisting things and he'll go, 'Just put your hips like this,' but they don't go that direction," Alley says of their grueling rehearsals.

"We have tape to prove that there's no shoving," Chmerkovskiy, 31, laughs. "I'm very gentle. I'm very supportive."

As Chmerkovskiy whips Alley into fighting form, fellow contestant Kendra Wilkinson hints that she has a secret weapon for the March 21 premiere.

"I feel like my strength is my booty shake," the E! reality star, 25, says. "But I can't get too caught up in my booty shake because it's the small details that actually matter in dancing."