Kate Beckinsale says she's 'never actually had an entire glass' of alcohol


Getting a body like Kate Beckinsale's doesn't come easy.

The 43-year-old actress bares her toned bod on the cover ofShape's January/February 2017 issue, and details her health regimen inside the mag, starting with what she drinks (or doesn't).

WATCH: Kate Beckinsale Shares Adorable Back-to-School Pic of Lookalike Daughter Lily Sheen

"I don't drink alcohol," she reveals. "I feel [its effects] very quickly, so I've never actually had an entire glass of anything alcoholic."

While Beckinsale has no problem saying no to alcohol, she admits that motivating herself to work out is a little bit harder.

"I start out absolutely dreading it, do an incredibly punishing workout, b*tch about it the whole time and end up feeling 100 percent better when I leave," she says. "Working out is basically nature's antidepressant."

RELATED: Kate Beckinsale Got Daughter Lily in Trouble After Drawing a NSFW Doodle on Her Homework

The Underworld star also credits her trainer, Gunnar Peterson, for getting her through the toughest workouts by focusing on family instead of exercise.

"I work out hard with Gunnar five or six times a week. We have loads in common, like our kids," explains Beckinsale, who shares 17-year-old daughter Lily with her ex, Michael Sheen. "During our sessions we have long talks about teenagers, and then suddenly one day I find that my a** is in a lot better shape than I thought it was!"

See Kate Beckinsale through the years:

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Kate Beckinsale through the years
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Kate Beckinsale through the years
NEW YORK - APRIL 06: Kate Beckinsale and Ex. Michael Sheen are seen out in Manhattan on April 06, 2016 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NEW YORK - APRIL 05: (EXCLUSIVE COVERAGE) Kate Beckinsale, Lily Mo Sheen and Michael Sheen are seen in Soho on April 5, 2016 in New York City. (Photo by Alo Ceballos/GC Images)
NEW YORK, NEW YORK - APRIL 05: (EXCLUSIVE COVERAGE) (L-R) Lily Mo Sheen, Michael Sheen and Kate Beckinsale on April 5, 2016 in New York City. (Photo by Alo Ceballos/GC Images)
BEVERLY HILLS, CA - JANUARY 12: (L-R) Michael Sheen, Kate Beckinsale and Len Wiseman attends the Weinstein Company's 2014 Golden Globe Awards after party on January 12, 2014 in Beverly Hills, California. (Photo by Tommaso Boddi/Getty Images)
Kate Beckinsale and Michael Sheen (Photo by George Pimentel/WireImage)
WEST HOLLYWOOD, CA- MARCH 24: Actor Michael Sheen and actress Kate Beckinsale attend the 10th Annual Elton John AIDS Foundation InStyle Party on October 24, 2002 at the Moomba Restaurant in West Hollywood, California. (Photo by Ron Galella, Ltd./WireImage)
LONDON - FEBRUARY 4: Actress Emma Thompson and Michael Sheen, ex-husband of British actress Kate Beckinsale, arrive at the 'Sony Ericsson Empire Film Awards' at The Dorchester Hotel on February 4, 2004 in London. (Photo by Dave Hogan/Getty Images)
Michael Sheen, Lilly Beckinsale, and Kate Beckinsale (Photo by Marcel Thomas/FilmMagic)
TORONTO, ON - JULY 12: Actress Kate Beckinsale and actor Michael Sheen attend the After-Party for the Canadian Premiere of 'Harry Potter and The Deathly Hallow Part 2' at Casa Loma on July 12, 2011 in Toronto, Canada. (Photo by George Pimentel/WireImage)
Actress Kate Beckinsale and actor Michael Sheen with daughters attend the After-Party for the Canadian Premiere of 'Harry Potter and The Deathly Hallow Part 2' at Casa Loma on July 12, 2011 in Toronto, Canada.
Michael Sheen, Lilly Beckinsale, and Kate Beckinsale (Photo by Marcel Thomas/FilmMagic)
Michael Sheen and Kate Beckinsale during 2001 My VH1 Awards - Arrivals at Shrine Auditorium in Los Angeles, California, United States. (Photo by Jeff Kravitz/FilmMagic)
(GERMANY OUT) 1973Schauspielerin; Grossbritannienmit ihrem Lebensgefährten, dem britischen Schauspieler Michael Sheen, bei der Deutschlandpremiere des Kinofilm 'Pearl Harbor' in Berlin auf dem Flughafen Tempelhof (Photo by Christian Bach/ullstein bild via Getty Images)
LOS ANGELES - DECEMBER 2: Actress Kate Beckinsale and actor Michael Sheen attend the Second Annual My VH1 Music Awards on December 2, 2001 at the Shrine Auditorium in Los Angeles, California. (Photo by Ron Galella, Ltd./WireImage)
Kate Beckinsale & Michael Sheen (Photo by SGranitz/WireImage)
Michael Sheen and Kate Beckinsale during 'Romeo & Juliet' - London Premiere - Arrivals at Leicester Square in London, Great Britain. (Photo by Fred Duval/FilmMagic)
Michael Sheen and Kate Beckinsale during The Evening Standard Theatre Awards 1998 at The Savoy in London, Great Britain. (Photo by Fred Duval/FilmMagic)
Kate Beckinsale & Michael Sheen Attend The 'Haunted' Premiere In London. (Photo by Antony Jones/UK Press via Getty Images)
Kate Beckinsale and boyfriend Michael Sheen (Photo by Tom Wargacki/WireImage)
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"Hardcore workouts have really made a big difference in my life," she continues. "I have a lot of internal energy, and intense exercise helps me channel that energy. I find balance by doing a workout that makes me pour sweat. I never was that girl before, but I am now."

WATCH: Michael Sheen and Kate Beckinsale Adorably Embrace Upon Hearing Their Daughter Lily Got Into College

Beckinsale will have a lot more time for her hardcore workouts in a few months, when her daughter heads off to college -- and she's not complaining!

ET sat down with the actress earlier this month, where she explained why she's looking forward to having an empty nest.

"It's nice as well because it gives me a little bit more room to write and to do other things that I've not necessarily been able to do," she confessed. "That's obviously changed in the last couple of years because [Lily's] not dying to hang out with me every minute of the day anyway, but I'm pretty excited about it."

RELATED: Kate Beckinsale 'Loves' Ex Michael Sheen and His Girlfriend Sarah Silverman: 'It's a Good Thing'

See more in the video above.

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Stars and their lookalike kids in 2016
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Stars and their lookalike kids in 2016

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NEW YORK, NY - SEPTEMBER 14: Julianne Moore (L) and Liv Freundlich attend the Ralph Lauren fashion show during New York Fashion Week September 2016 at the Ralph Lauren Madison Avenue Store on September 14, 2016 in New York City. (Photo by Paul Morigi/WireImage)

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