Jillian holds a Bachelor's degree in Exercise Science from Felician University and has six years of experience as a personal trainer. She has completed DBC LVL 1, LVL 2 and LVL 3, which has deepened her knowledge of biomechanics and human performance. O’Brien’s approach centers on functional movement, mobility work, and injury prevention - helping clients build strength that translates into real-life performance.

Jillian places a strong emphasis on precision, proper form, and technique, ensuring every session is safe, intentional, and effective. While physical progress is important, her mission goes beyond just fitness.

“I aim to unlock each client’s true potential, empowering them to believe in themselves, their capabilities, and what they can achieve both inside and outside of the gym.”