A person in workout clothes, wearing a black cap and a smartwatch, is performing a side plank exercise on a specialized incline bench in a gym with brick walls, various weights, and gym equipment visible.
A person in workout clothes, wearing a black cap and a smartwatch, is performing a side plank exercise on a specialized incline bench in a gym with brick walls, various weights, and gym equipment visible.

Built Around the Relationship That Matters Most.

For nearly twenty-five years, Arthur Baca has been a trusted presence in the Upper East Side’s fitness community. Throughout the constant evolution of the fitness landscape, Arthur has found one principle to be unwavering: the transformative power of the trainer–client relationship. Apartment AB was created around that relationship.

Two people working out in a gym. The man on the left is lifting weights while the woman on the right is standing and observing, both wearing athletic clothing and white sneakers. There are mirrors and gym equipment in the background.
Two people working out in a gym. The man on the left is lifting weights while the woman on the right is standing and observing, both wearing athletic clothing and white sneakers. There are mirrors and gym equipment in the background.

Apartment AB was designed to give independent trainers the freedom to do their best work—and their clients a private, focused environment in which to train.

No crowds. No distractions. Just a thoughtfully equipped, beautifully maintained space where every session can remain personal.

Designed by a Trainer. Built for Personal Training.

Two women are exercising in a gym with brick walls. One woman is sitting while holding a weight, and the other woman is standing, engaging in a conversation. The gym has various workout equipment, weight racks, and windows.

From carefully selected equipment and expansive training space to fresh towels, private amenities and a strictly limited number of trainers and clients each hour, every detail of Apartment AB has been considered with one goal in mind: a better personal training experience.

Set above Madison Avenue in the heart of the Upper East Side, it's a space designed to feel as good as it functions.

Thoughtfully designed. Purposefully Private.

Come home to Apartment AB.

Experience a more private way to train.

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