Progress tracking built in
Every membership tier includes a monthly benchmark check-in. Your coach logs your lifts, your times, and your mobility scores — so there's never any guessing about whether you're moving forward.
Philadelphia · Since 2011
The gym that proves what you're capable of.
Hartwell & Sons tracks your progress from day one so you can see — in numbers — how far you've come.
See Membership Options
Built around your results, not our reputation.
Most gyms measure success by how many people walk through the door. We measure it differently: by how many members hit a new personal best this month, how many first-timers stick around past week four, and how many people leave a session genuinely stronger than when they arrived. Hartwell & Sons opened on Frankford Avenue in 2011 because Philadelphia deserved a gym that treats progress as a promise, not a tagline. Our coaches track your lifts, your cardio benchmarks, and your class attendance — and they call you out (kindly) when you're ready to level up. Warm terracotta-cream walls and natural light give the space a feel that's serious without being cold. This is a working gym, and every piece of equipment earns its floor space.
What makes the difference here.
Coaches who remember your name
Our training staff is small enough to know every member personally. They'll adjust your programme on the fly, spot a form issue before it becomes an injury, and push you on the days you need it most.
Equipment that does real work
Power racks, cable systems, rowers, kettlebells, and a turf lane — chosen because our members asked for them. Nothing gimmicky; everything maintained to a standard you'd expect from a serious facility.
Classes that fill up fast
HIIT, barbell strength, mobility flow, and early-bird conditioning — each class is capped at 14 so the coach can actually see you. Book ahead or drop in when there's a spot.
No lock-in membership pressure
Month-to-month memberships that flex with your life. We keep members because they get results — not because the cancellation process is complicated.
“I'd been going to the big-box gym around the corner for two years and my squat hadn't moved in eight months. Six weeks at Hartwell & Sons with Coach Dana and I added 35 lbs to my one-rep max. The monthly check-ins are what did it — there's nowhere to hide when the numbers are right in front of you.”
— Marcus T., Fishtown
Results you can actually count.
13 years
Serving Philadelphia athletes and everyday movers since 2011 from the same Frankford Ave location.
94%
Of members who complete their first 90 days are still active at the one-year mark — a retention rate we're proud of.
18 classes/week
Across four formats, morning through evening, seven days a week — so scheduling conflicts run out of excuses.
1:14
Coach-to-member ratio in every group class. You're always visible, never just another body in the back row.
Your first two weeks are on us.
New members get a free 14-day trial and an initial strength assessment with a Hartwell coach. No commitment required — just show up.
Claim Your Free Trial