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Ruby Rivera

Also known as Muscle Mommy, Ruby Rivera Fit

Born
Jan 24, 2001age 25
height
5'2" (or 157 cm)
body type
Muscular

Biography

About Ruby Rivera

Edited by the community

Ruby Rivera is a 25-year-old American fitness trainer, influencer, and TikTok star who has built a massive following under her brand "Ruby Rivera Fit" (@_riverafit). She was born on January 24, 2001, and is of mixed-race background, primarily Caucasian. Ruby now lives in San Diego, California, where she trains and creates content. She has 573,000 Instagram followers and has also gained significant traction on TikTok. Her physique is muscular, standing at 5'2" with a weight that has fluctuated between her off-season bulk of 143 pounds and her stage conditioning. She has blonde hair, brown eyes, a nose piercing, and various tattoos.

Ruby's journey into fitness was not a straight line. After stepping away from competitive childhood sports and experiencing burnout in a corporate job, she switched to studying kinesiology and committed to heavy strength training. That pivot led her to compete in natural bodybuilding circuits, where she earned high placements on the amateur NPC stage. She is known for her extreme discipline in macro tracking and for documenting her 100% natural bulk and cut phases. Her content challenges traditional ideas about female fitness, showing that women can build dense muscle while maintaining their own definition of femininity. Because of that approach, she became a prominent figure in the "Muscle Mommy" movement. She is also a sponsored athlete, partnering with brands like Young LA and Gorilla Mind.

In 2026, Ruby welcomed a healthy baby boy, a milestone her fanbase celebrated. She documented her training through pregnancy, maintaining high-density workouts and strict nutrition up to delivery. Her story has captured attention across fitness media, cementing her as a leading voice in natural bodybuilding. She continues to train and film in San Diego, building a community around strength, discipline, and motherhood. Ruby's rise to prominence at a young age has made her a standout in her field. Her story resonates because it combines athletic achievement with personal authenticity.

Record

Profile details

Body

Hair Color
Blonde
Eye Color
Brown
Weight
143 lbs (or 65 kg)
Tattoos
Various
Piercings
Nose

Extra

Instagram Followers
573k (as of May 2026)

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Frequently asked

How has Ruby Rivera's weight changed between her bulk and cut phases?

Her recorded off-season peak bulk reached 143 lbs, which she then cut down over a six-month natural cutting phase to reach stage conditioning.

What brands does Ruby Rivera partner with as a sponsored athlete?

She is signed as a code-tier athlete with Young LA and Gorilla Mind.

What approach does Ruby Rivera take to bodybuilding?

She documents 100% natural bulk and cut phases, focusing on heavy compound lifts and strict macro tracking, and she is known for challenging traditional ideas about female fitness.

How did Ruby Rivera's pregnancy affect her training?

She continued to train safely through pregnancy, keeping high-density workouts and strict nutritional goals up to her delivery date, and welcomed her baby boy in May 2026.

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