Massy Arias

Massiel "Massy" Indhira Arias is a Dominican-American certified personal trainer, fitness creator, health coach, and entrepreneur. Born on November 23, 1988, in Santo Domingo, Dominican Republic, she immigrated to the United States as a teenager. Known online under the handle massy.arias and formerly as MankoFit, Arias has established herself as a prominent digital fitness figure, encouraging millions to adopt active mindsets while emphasizing mental health and self-acceptance.

Early Life and Fitness Journey

Growing up in Santo Domingo, Arias moved to the United States at age 14. Navigating a new language and culture while managing personal adversity led her into severe depression during early adulthood. Seeking an outlet for her emotional well-being, she turned to exercise. Through resistance training and structured workouts, Arias discovered a passion for physical conditioning. Fitness became a transformative tool that restored her mental resilience, inspiring her to earn a personal trainer certification and guide others toward healthy lifestyle changes.

Career and Content Creation

Arias began posting workout videos, progress updates, and motivational guidance on Instagram, quickly attracting an international community. Her training philosophy integrates strength work, calisthenics, yoga flows, and functional HIIT routines. Her Instagram account (@massy.arias) has built a community of over 3.1 million followers, while her YouTube channel (@Mankofit) provides follow-along routines and nutritional advice to over 1.4 million subscribers. She is widely praised for advocating body positivity and post-partum health awareness.

Business Ventures and Impact

Expanding her personal brand, Arias launched TRU Supplements, a natural plant-based nutrition company, alongside Tru.training and MA Warrior online programs, which deliver workout challenges and customized meal plans. She has partnered with major global brands, including Adidas and Fabletics, as a brand ambassador. In addition to digital content, Arias frequently speaks at wellness expos, promoting accessible exercise routines, proper nutrition, and holistic self-care.

Personal Life

Arias was previously married to fitness entrepreneur Stefan Williams, with whom she has a daughter named Indira. Following her divorce, she has been open about navigating single motherhood and setting healthy personal boundaries. Bilingual in English and Spanish, Arias reaches a global audience and currently resides in Miami, Florida.