Heidi showed off a series of impressive workouts during the video, including pressups and lunges.
It comes after Heidi was forced to hit back at trolls and deny that she was pregnant over the weekend.
Hitting back: She was recently forced to hit back at trolls who asked if she was pregnant after she enjoyed a beach day in Carpinteria, California, recently
Workout: The Hills star, 34, took to her Instagram to share a video of herself exercising where she showed off her flat stomach in a pink patterned crop top
The clarification came a month after she showcased her frame in a neon green bikini while splashing in the Carpinteria surf.
She recently joked that There would be no show without me .
And Heidi Montag cut a stylish figure in a cut-out khaki top as she continued to film scenes for the reality show The Hills: New Beginnings in Lake Tahoe, California last week.
The reality star, 34, appeared in great spirits as she was joined by husband Spencer Pratt, 37, and their three-year-old son Gunner, whom they gleefully swung between them.
Looking good: Heidi Montag cut a stylish figure in a cut-out khaki top as she continued to film scenes for the reality show The Hills: New Beginnings in Lake Tahoe, California last week
Honey, that s Gunner s grilled cheese : On Valentine s Day, Montag s husband of 12 years Spencer Pratt scolded her for eating their three-year-old son Gunner s grilled cheese sandwich rather than the Caesar salad she ordered
The 37-year-old Pratt Daddy Crystals owner said via Instastory: Honey, that grilled cheese is not for you, honey. Chef Manny made that for Gunner Honey, that grilled cheese is not for you, honey. Chef Manny made that for Gunner.
Spencer then treated the Colorado-born blonde to Italian lingerie boutique La Perla on Rodeo Drive in Beverly Hills for a shopping spree.
Heidi - who famously underwent 10 plastic surgery procedures in one day back in 2010 - looked fantastic in a red silk robe and matching lingerie set.
The cast of The Hills: New Beginnings enjoyed a day on the slopes in Lake Tahoe while filming for the new season of the hit MTV Show.
Brody Jenner, Spencer and Heidi Pratt, and the son of Pamela Anderson and Tommy Lee - Brandon Thomas Lee - were seen gearing up for a day of skiing and snowboarding on Thursday.
Hitting the mountain for some snow-covered fun, the Los Angeles based bunch bundled up in colorful weather-appropriate garb as they let loose.
They re back!: The Hills: New Beginnings castmates Brody Jenner, Heidi and Spencer Pratt and Brandon Thomas Lee hit the slopes in Lake Tahoe for an afternoon of snow-covered fun as they continue to film for the new season of the hit MTV show