LOL! Tia, Tamera Mowry Sweat to the Oldies With Richard Simmons

LOL! Tia, Tamera Mowry Sweat to the Oldies With Richard Simmons

Welcoming son Cree last summer, Tia Mowry still struggles with her post-baby body -- and is willing to pull out all the stops to snap back into her pre-pregnancy shape.

On Monday's episode of STYLE's Tia & Tamera, mom Mowry, 33, and her twin sister, Tia, turn to to weight loss guru Richard Simmons to shed pounds.

"I didn't want Tia to focus so much on losing the [baby] weight that she'd forget how fun [working out] could actually be," Tamera reasons in a preview clip from Monday's show. "Richard Simmons is the perfect person for that. He works your behind off, but he's so much fun!"

Indeed, the sisters have a ball when they stop by the Sweatin' With the Oldies superstar's fitness studio in L.A. As she laughs her way through the high-energy class, a sweaty Tia is inspired by another gym goer.

"When I see a woman 80 years old doing the same workout I'm doing and she's doing a hell of a job at it, I think 'I can do it, too,' Cree's mama explains. That's what I like about this class."

Watch the clip above for more of Simmons' wacky gym antics before the full episode of Tia & Tamera airs Monday at 8 p.m. (EST) on STYLE.