Train by heart,
not by guesswork.
Every day at Thres has a heart-rate zone and a class built for it. Open a day, see the session, and book your place.
About the studio
We coach the number on the wall, not the one on the scale.
Thres opened in a tannery warehouse in 2019 with twelve chest straps and one idea: train at the right effort and the rest follows. Six years on, the straps have multiplied. The idea has not changed.
classes a week, from six in the morning
people in a class, at the very most
The room right now
Open a day above or pick a zone below, and this follows. The wall over the training floor does the same.
The five zones
One honest number.
Five ways to use it.
Your heart rate tells the truth about how hard you are working. We put it on the wall, read it with you, and coach you to the right zone for the day.
Classes
Six classes.
Every one has a zone.
Tempo
45 min
Strength circuit
Barbells, kettlebells and carries across six stations. Steady effort, clean movement, no ego.
Base
45 min
Engine: row and ride
Long, easy intervals on the rower and the bike. The class that makes every other class feel lighter.
Thres
45 min
Thres intervals
Three rounds held just under your limit. Hard to love, impossible to argue with.
Recover
40 min
Mobility and breath
Slow stretching, breath work and time on the floor. Your heart rate drops, and so do your shoulders.
Max
30 min
Max: bag and sled
Short, loud and over quickly. Sprints, sled pushes and heavy bag rounds with full recovery between.
Base
70 min
Long run club
Eight easy kilometres along the harbour at a pace you can talk through. Coffee afterwards.
Inside a class
Forty-five minutes,
five gears.
Station work, three rounds
Sled, ropes, bike. Repeat.
01
Warm up
8 min
Easy rowing and openers. Your heart rate climbs into Base and stays there.
02
Build
12 min
Strength sets at a steady Tempo. You could talk, but you would rather not.
03
Hold
15 min
The work. Three rounds at Thres with a coach on every station.
04
Peak
4 min
Four all-out efforts. Thirty seconds on, thirty seconds off.
05
Come down
6 min
Walk, breathe, stretch. We watch the number fall together.
Coaches
Coached by people,
not playlists.
Head coach, strength
Former 400 metre runner. Will notice your heart rate before you do.
Conditioning
Rowed for his country, now rows next to you. Counts down, never up.
Mobility and recovery
Physiotherapist by training. Believes the easy days are where it happens.
Run club
Marathoner, pacer, optimist. Has never once left anyone behind.
Members
Proof you can count.
Resting heart rate
I stopped guessing. Six months in, my resting heart rate is lower than it was at twenty-five.
Priya Raman
Member since 2024
Ten kilometre time
Turns out I was doing every session too hard. Slowing down is what finally made me faster.
Daniel Okafor
Member since 2023
Nights of good sleep a week
I came for the bag class and stayed for Thursdays. I sleep properly for the first time in years.
Leila Haddad
Member since 2025
Recovery after one minute
The zones sound like a gimmick until you train with them. Now I can feel Zone 2 without looking.
Marcus Lindqvist
Member since 2022
Membership
Three ways in.
No joining fee.
Drop in
For the weeks that will not sit still.
£18
a class
Any class, any day
Strap and ramp test included
Book up to seven days ahead
No commitment
Three a week
Most members
One easy, one steady, one hard. The plan most people keep.
£96
a month
Twelve classes a month
Zones re-tested every eight weeks
Monthly check-in with your coach
Pause for two months a year
Unlimited
For people who would rather be here than anywhere else.
£129
a month
Every class, every day
Open floor between classes
Bring a friend on Saturdays
First place on waiting lists
Questions
Asked often,
answered straight.
If yours is not here, write to us. A coach answers, usually the same day.
Find us
Unit 4, Tannery Wharf, Bristol BS1 6QH
Open
Monday to Friday, 06:00 to 21:00. Saturday, 08:00 to 14:00.
Write
Do I need my own heart-rate monitor?
No. We lend you a chest strap for every class and it pairs with the screens in the room. If you already own a strap or a watch that broadcasts heart rate, bring it.
I'm not fit yet. Will I keep up?
Zones are personal. Your Zone 4 and your neighbour's Zone 4 feel the same and look completely different, which is the point. Nobody is behind.
How many classes a week should I do?
Most members settle on three: one easy, one steady, one hard. Your coach will help you choose the days in your first week.
What happens in my first class?
Arrive fifteen minutes early. We fit your strap, find your maximum heart rate with a short ramp test and walk you round the room. The class itself is on us.
Can I pause or cancel my membership?
Yes. Pause for up to two months a year, or cancel with thirty days' notice, both from your account. No forms and no phone calls.
Where are you, and is there parking?
Unit 4, Tannery Wharf, five minutes on foot from the station. There are bike racks at the door and a public car park across the bridge.
First class
Your first class
is on us.
Come fifteen minutes early. We fit a strap, find your maximum with a short ramp test and show you round. Then you train.
Strap and ramp test included
Changing rooms, showers and towels
No card needed to book
Book a free first class
Tell us who is coming and which day suits.
We reply within a working day. No newsletters unless you ask for them.