Jennifer Lopez works up a sweat in her Preston High School jacket at the gym… a week before she resumes filming Unstoppable

Jennifer Lopez worked up a sweat on Tuesday at her second home, also known as Tracy Anderson’s member gym, in Studio City.

The 48-year-old celebrity fitness trainer charges a starting fee of $1,500 plus annual dues for VIP access to her gym – according to City & Country.

The 54-year-old pop star wore a maroon jacket from her alma mater — the all-girls Preston High School in the Bronx — where she ran track, did gymnastics, played softball and performed in musicals between 1982 and 1986.

Jennifer paired her retro jacket with a matching bag, ombré sparkly leggings and white Prada sneakers.

Lopez wore no makeup under huge sunglasses for her workout and scraped her natural brunette locks into a messy bun.

To maintain her fit 6-foot-2 height, the two-time Grammy nominee likes to sweat first thing in the morning and is “not afraid to challenge herself” with Anderson and New York-based trainer David Kirsch.

“I’m always evolving and looking for things that keep me excited and motivated,” Jennifer said We weekly earlier this year.

‘It’s no secret that fitness is a very important part of my life. I think there is a positive correlation between exercise and mental health. If you find a good balance through determination and focus, we naturally strive to be the best version of ourselves.’

Lopez’s street sighting occurred the same day Artists Equity announced Deadline that filming of her movie Unstoppable would resume from December 12 – seven months after production was halted due to the WGA strike.

The Mother producer-star rocked darker hair and arm tattoos on set to portray Judith Robles, the mother of one-legged wrestling champion Anthony Robles, in the directorial debut of Oscar-winning editor William Goldenberg.

Jharrel Jerome, Don Cheadle, Michael Peña and Bobby Cannavale will also star in Unstoppable – based on the 35-year-old athlete and Austin Murphy’s book of the same name – which Amazon MGM Studios will distribute.

Jennifer likely landed the role thanks to her fourth husband – two-time Oscar-winning filmmaker Ben Affleck – who produces Unstoppable alongside his Boston BFF, Matt Damon.

“I can’t put into words how honored, excited and blessed I am to not only have my story made into a movie, but to have that movie made by Ben Affleck and Matt Damon is incredible!” Anthony flowed on Instagram back in March.

The 54-year-old pop star wore a maroon jacket from her alma mater — the all-girls Preston High School in the Bronx — where she ran track, did gymnastics, played softball and performed in musicals between 1982 and 1986.

Jennifer paired her retro jacket with a matching bag, ombré sparkly leggings and white Prada sneakers

Lopez went makeup-free under huge sunglasses for her workout and scraped her natural brunette locks into a messy bun

To maintain her fit 6-foot-2 height, the two-time Grammy nominee likes to sweat first thing in the morning and is “not afraid to challenge herself” with Anderson and New York-based trainer David Kirsch.

Lopez’s street sighting occurred on the same day that Artists Equity announced to Deadline that filming on her film Unstoppable would resume as of December 12 – seven months after production was halted due to the WGA strike (pictured on set May 17)

The Mother producer-star rocked darker hair and arm tattoos on set to portray Judith Robles (R, pictured in 2011), the mother of one-legged wrestling champion Anthony Robles (L), in Oscar-winning editor William Goldenberg’s directorial debut

Jharrel Jerome, Don Cheadle, Michael Peña and Bobby Cannavale will also star in Unstoppable – based on the 35-year-old athlete (pictured) and Austin Murphy’s book of the same name – which Amazon MGM Studios will distribute

Jennifer likely scored the role thanks to her fourth husband – two-time Oscar-winning filmmaker Ben Affleck (L, pictured March 18) – who produces Unstoppable alongside his Boston BFF, Matt Damon (R).

Anthony shared on Instagram in March: “I can’t put into words how honored, excited and blessed I am to not only have my story made into a movie, but to have that movie made by Ben Affleck and Matt Damon, which is incredible! I’m so excited for what’s to come!’

“So excited for what’s to come!”

Lopez has also been promoting her new single Can’t Get Enough, which will be released on January 10.

Can’t Get Enough will appear on Intimissimi’s global ambassador’s ninth studio album This Is Me… Now, which is also the name of her ‘Musical Experience’ premiering on Amazon Prime Video on February 16.

The rock doc reunited Jennifer with director Dave Meyers, who previously directed four of her music videos for All I Have, I’m Real, I’m Real (Murder Remix) and I’m Gonna Be Alright between 2001 and 2002.

Lopez reportedly dedicated nine songs to Ben on This Is Me… Now, which is her first record since 2014’s AKA.

It’s been over a year since the Emmy-nominated producer wrapped up the titular role in Netflix AI thriller Atlas, and director Brad Peyton net included the film score at Abbey Road Studios in London in October.

“We had a good time,” Jennifer – who has 392.9 million social media followers – said on Instagram Live.

‘This is a beautiful film about the future, but it is also about letting people in.’

Lopez is also an executive producer of Good Trouble, the spinoff from Joanna Johnson, Bradley Bredeweg and Peter Paige, which resumes its fifth season on Freeform on January 2.