Train Smarter.
Move Better.
Live Stronger.
Premium personal training — right in your building. Ex-Equinox trained. Specializing in weight loss, injury prevention, and lasting results.
Trained at Equinox.
Built from lived experience.
Jack Karski is an ex-Equinox personal trainer who brings professional-level programming to your building’s fitness center — without the premium gym price tag.
But what sets him apart is that he’s been through it himself. He’s lost 25 lbs and is still going. He rehabbed a shoulder injury so severe he couldn’t lift a glass of water without pain. And after years at a desk, he rebuilt his posture from scratch. Every program he writes is built on real experience — not just a textbook.
When your trainer is one floor away, there’s nothing stopping you.
Specializations
Weight Loss
Evidence-based fat loss programming designed around your lifestyle. Sustainable results, not shortcuts.
Form & Technique
Master the fundamentals. Learn how to move correctly so every rep counts and nothing gets wasted.
Injury Prevention
Identify imbalances before they become problems. Train smarter and stay in the game long-term.
Fitness Conditioning
Build the engine — cardiovascular endurance, strength, and mobility that compounds over time.
From Previous Clients.
“Jack transformed how I think about training. In 8 weeks I was stronger than I'd been in years — and nothing hurt.”
“Jack doesn't let you coast. Every session is intentional, every rep has a purpose. I've seen more progress in 3 months than I did in two years on my own.”
“I came in with a bad knee. Jack rebuilt my form from the ground up. Haven't had pain since.”
Simple. No contracts.
All sessions are paid upfront. Recurring clients are billed automatically.
Your first session. We assess your baseline, understand your goals, and build your plan.
Get StartedFour sessions every month, billed automatically. Most popular option.
Get StartedBuild a consistent schedule. Automatically charged — no admin overhead.
Get StartedThe gym is downstairs.
The trainer should be too.
Take the 5-minute assessment. Jack will review it personally and reach out before your first session.
Take the Questionnaire