No wall, no anchor
Stand on it and train
Put it on the floor, stand on the platform and pull – the strap comes from below. Nothing to mount.
A gym in a box
Kynett STREXBOX™
Stand on it and train – no wall, pole or anchor. Up to 200+ kg / 440+ lbs.
€1.337,86
€1.486,61Save €148,75Tax included · Free shipping
Black Friday · our only sale of the year · ends 30 Nov
Choose your KynettCompare models
Free
Free biceps/triceps bar In stock. Shipped within 5–7 business days.
- 2-year warranty
- 30-day returns
- Made in the EU
Included in the box
STREXBOX
Disc M
Harness
Multifunctional handle
Strap adjust
Carabiner
Webbing 2.5 m
Specifications
Resistance: 0–200+ kg / 440+ lbs – you set the load with your own pull
Inertia: 0.038–0.212 kgm², with up to two STREXBOX discs stacked
Included disc: Disc M (0.086 kgm²), comparable to the 15 mm Kynett disc set
Size: 60 × 40 × 10 cm / 24 × 16 × 4 in
Weight: 11 kg / 24 lbs (16 kg / 35 lbs with standard disc)
Strap length: 2.5 m
Compatible discs: STREXBOX discs S, M and L only
Made in the EU
Discs & inertia
The STREXBOX uses its own discs: S, M and L. Stack up to two to change the inertia – the harder you pull, the harder it pulls back.
| Disc set | Inertia | Best for |
|---|---|---|
| Disc S | The lightest STREXBOX disc | |
| Disc MIncluded | 0.086 kgm² | Comparable to the 15 mm Kynett disc set |
| Disc L | The heaviest STREXBOX disc | |
| Stacked (up to 2) | 0.038–0.212 kgm² | Combine discs for the inertia you want |
Only STREXBOX discs fit the STREXBOX; FIT, PRO and HOME disc sets do not.
Shipping, returns and warranty
Shipped with UPS or FedEx within 5–7 business days, with track & trace. Free shipping on orders from €200. You can return your STREXBOX within 30 days, and it comes with a 2-year warranty.
Need help choosing?Take the 1-minute quiz or talk to a flywheel specialist.
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- 10.000+ flywheels in use worldwide
- 59 countries
- Since 2018 developed with physiotherapists
Why flywheel training
Strength that adapts to you.
Pull, and the flywheel spins up. Brake it on the way back. Every rep loads both directions – the way physiotherapists and Olympic athletes train.
Small box. Serious load.
Up to 200+ kg / 440+ lbs
Heavy enough for squats and deadlifts
The included Disc M already compares to the heaviest 15 mm Kynett disc set.
Stack up to 2 discs
Choose your inertia
Stack two discs for up to 0.212 kgm²; the range runs from 0.038 kgm².
Strexbox
A full gym in a box
Upper and lower body on one compact platform – for practices, studios and home gyms.
How it works
Three steps. Every rep.
You pull
The strap unwinds and spins the flywheel. Pull harder and the resistance rises with you.
It stores your energy
At the end of the movement the strap rewinds, carried by the energy you put in.
You brake it back
Slowing it down loads the lowering phase – eccentric overload, where strength is built.
Exercises
What you can train – and what you need
Everything below works with what's in the box. The strap comes from below, so lifts, pulls and presses all start from the platform.
- Squat
- Harness
- Split squat
- Harness
- Calf raise
- Harness
- Deadlift and Romanian deadlift
- Biceps/triceps bar or multifunctional handle
- Bent-over row
- Biceps/triceps bar or multifunctional handle
- Biceps curl
- Biceps/triceps bar
- Shoulder press
- Biceps/triceps bar or multifunctional handle
- Lateral raise
- Multifunctional handle
“Working with Kynett is amazing. I use Kynett to improve my strength and to prepare for my fights.
Real athletes
See it in action
Compare
Is the STREXBOX right for you?
Compact entry
HOME · €377,86
€445,28Save €67,42Up to 50 kg / 110 lbs*
4.9 kg / 10.8 lbs
Rack, pole or wall
HOME discs 3–5 mm More power
FIT · €713,05
€891,58Save €178,53Up to 70 kg / 154 lbs*
7.7 kg / 17 lbs, aluminium
Rack, pole or wall
Discs 3–15 mm Fixed station
PRO · from €1.196,03
€1.407,28Save €211,25Up to 70 kg / 154 lbs*
Wall adjust 166 cm / 65 in
For daily pro use
Discs 3–15 mm You're here
STREXBOX · €1.337,86
€1.486,61Save €148,75Up to 200+ kg / 440+ lbs
11 kg / 24 lbs, free-standing
16 kg / 35 lbs with standard disc
STREXBOX discs S–L
HOME · €377,86
4.9 kg / 10.8 lbs
Rack, pole or wall
HOME discs 3–5 mm More power
FIT · €713,05
7.7 kg / 17 lbs, aluminium
Rack, pole or wall
Discs 3–15 mm Fixed station
PRO · from €1.196,03
Wall adjust 166 cm / 65 in
For daily pro use
Discs 3–15 mm You're here
STREXBOX · €1.337,86
11 kg / 24 lbs, free-standing
16 kg / 35 lbs with standard disc
STREXBOX discs S–L
* Maximum resistance with the included 4 mm disc set – you set the load with your own pull. Other disc sets: HOME 25–65 kg / 55–143 lbs (3–5 mm); FIT and PRO 20–200+ kg / 44–440+ lbs (single 4 mm disc up to the 15 mm set). See the full comparison
Buy with confidence
Try. Train.
Decide.
Train with the STREXBOX for 30 days in your own space. Not right for you? Send it back.
- 30-day returns Send it back within 30 days.
- 2-year warranty On every Kynett flywheel.
- Service from NL Help from our own team in the Netherlands.
- Fast delivery UPS, usually 1–4 business days.
Complete your setup
Made for the STREXBOX
STREXBOX Scheiben (S-M-L)Stack up to two discs
€118,26€157,68
SchultergurtRows and curls
€76,36
Aluminium Close Grip HandgriffClose-grip rows and pulls
€84,25
KniebeugenkeileHeels up for deeper squats
€53,56€88,26
Reviews
Do I need a wall, rack or anchor?
No. Put the STREXBOX on the floor, stand on the platform and train – the strap comes from below.
Which discs fit?
Only STREXBOX discs (S, M and L). You can stack up to two. Disc M is included; FIT, PRO and HOME disc sets do not fit.
How heavy can it get?
Up to 200+ kg / 440+ lbs. You set the load with your own pull; the included Disc M already compares to the 15 mm Kynett disc set.
What's the difference with the FIT and PRO?
The FIT and PRO hang on a rack, pole or wall and pull from the side or above. The STREXBOX stands on the floor and pulls from below – made for squats, deadlifts and every exercise that starts at your feet.
How fast is delivery?
The STREXBOX ships within 5–7 business days with UPS or FedEx, with track & trace.
What if it isn't right for me?
You can return it within 30 days.
