New Year's Resolutions: Check! It's Only January 3 and These Stars Are Already Hitting the Gym

Some people celebrate birthdays with cake, others with a couples' workout. The Good Place actress celebrated her hubby's birthday on Jan. 2 as they kicked off the new year and another year of life with a midday workout session — and a kiss.

If going to the gym every day means we'll look like J.Lo as we near 50, sign us up! After a laid-back holiday spent with boyfriend Alex Rodriguez and their blended family, the couple got back on their grind and kicked off the new year with a joint workout session at Gold's Gym in Los Angeles on Jan. 1.

The couple that works out together, stays together. A-Rod shared a video of him and Lopez tearing up the gym on Instagram.

The singer is already starting to "Level Up," and it's only the first day of the year. "We back, day one, what it do?" she said in a video on her Instagram Story.

Barrymore danced her way into the new year at 305 Fitness. "getting my New Year’s Eve dance on because I am too old to go clubbing," she joked on Instagram, adding the hashtags #momsnewyears, #stillneedtodance and #thisismygrownuparty. "MAY EVERYONE HAVE A HAPPY AND HEALTHY AND JOYUS NEW YEARS," the actress captioned the video of her breaking it down in a crowded dance class.

The comedian is making sure to start his year off right — by "winning." In a video posted to his Instagram Story, a hyped-up Hart shared his motivation to get back into the gym. "New year, new attitude, new goals, new blessings, new beginnings, new starts," he yelled, before admitting to having had a double espresso — which he explained is "why my energy is on cloud f— nine."

The actress, who hosts Red Table Talk with her mother, Adrienne Banfield-Jones, and daughter, Willow Smith, kicked off the new year by inviting some fitness bloggers onto the Facebook Watch show.

"Taking care of your body in the way in which you want is an act of self-love … Self-love is discipline," Pinkett Smith shared while introducing some at-home workouts. The three generations of women then learned some moves from YouTuber Whitney Simmons and Instagrammer Brittne Babe.

The model and new mama is working toward losing her baby weight this year — and it looks like she's already getting herself back on track!

Over the weekend, Upton admitted to indulging over the holidays — but shared that instead of letting that set her back, she's using it as motivation.

"I’m not going to lie to you and tell you I’ve been working out and eating healthy. It’s so hard over the holidays. Traveling and enjoying time with my family! I’m trying not to get down on myself. Instead use it as motivation to get right back at it! ... I have a long way to go to lose this baby weight but feeling determined for 2019!" she shared on Instagram.

The Real Housewives of Beverly Hills star ended 2018 as she plans to begin 2019 — as the GOAT, an acronym meaning "Greatest of All Time." "Going into 2019 like......" Rinna captioned the hilarious shot of her on a yoga mat with a goat on her back, adding a goat emoji.

Okay, so it's not exactly the gym — but Williams gearing up for the tennis showdown of the century while comforting her baby daughter might take the cake for celebs documenting their 2019 motivation.

"As I head into next year it’s not about what we can do it’s what we MUST do as working moms and working dads. Anything is possible," the tennis superstar urged on Instagram as she prepared for her match against Roger Federer at the Hopman Cup in Australia. "I am getting ready for the first match of the year and my dear sweet baby @olympiaohanian was tired and sad and simply needed mama’s love. So if it means warming up and stretching while holding my baby that’s what #thismama will do," she added.