The Widowmaker Set
Do 20 reps with your 10-rep-max weight to hit your physical and mental limit in one set.
- Difficulty
- Moderate
- Time to result
- ~days to results
- Steps
- 5
- Confidence
- 60%
The Widowmaker is a single set of 20 back-squat reps performed with a weight you would normally only manage for 10. You complete the first 10 reps, then instead of racking the bar you hold it on your back, take five to ten deep breaths, and grind out a few more reps at a time until you reach 20. By definition it seems impossible, but the rest-pause breathing between clusters makes it achievable in roughly ten minutes of effort. The point is not hypertrophy but the visceral experience of reaching your limit: ringing ears, tunnel vision, everything else falling away. Chris Williamson frames it as one of several interchangeable 'end of capability' experiences (alongside a long ice bath, a 2k max row, or a meditation retreat) that everyone should meet at least once.
Origin
Popularised in powerlifting and CrossFit circles as a breathing-squat challenge; discussed on Modern Wisdom episode 100 by Chris Williamson and the Propane Fitness hosts as the shortest, most visceral way to experience the edge of physical capability.
Core principles
- 01Voluntary suffering builds a tolerance you can't fake
- 02The limit lives in the mind before the body
- 03One brutal set can reset your relationship with discomfort
- 04Simplicity beats complexity when the goal is grit
How to run it
- 1
Load your 10-rep max
Put a weight on the bar that you can honestly only back-squat for about 10 reps. Too light and the challenge disappears.
Pro tip Warm up thoroughly first; you want no doubt about the weight, only about the reps.
Watch out Skip this entirely if you have current spine or knee issues.
- 2
Rep out the first ten
Unrack and complete 10 clean reps. This gets you to what feels like the natural end of the set.
Pro tip Stay braced and controlled; sloppy early reps compound as you fatigue.
- 3
Breathe with the bar on your back
Do not re-rack. Stand tall under the load and take five to ten deep breaths to buy back a little capacity.
Pro tip Count the breaths out loud or in your head to stop yourself bailing early.
Watch out Keep your core braced while standing; a loaded bar on a fatigued spine is unforgiving.
- 4
Grind out mini-clusters to twenty
Squat a few more reps, breathe again, and repeat. Work in small clusters until the total hits 20.
Pro tip Commit to a number before each cluster so you don't quit mid-rep.
Watch out Expect ringing ears and tunnel vision near the end; that is the experience, not a reason to panic.
- 5
Finish and recover
Complete rep 20, rack the bar, and let the wave pass. Note how far past the perceived limit you actually went.
Pro tip Reflect afterward: the ceiling you feared was mental, and you can recall that next time.
In the wild
On Modern Wisdom episode 100, the hosts describe the widowmaker as a set that 'takes 10 minutes to do': ten reps, then breathe, then more, until twenty. By the end 'you start to go deaf, you have ringing in your ears, taste blood' and 'all your cares drop away.' They present it as the shortest route to the same limit-state you'd otherwise reach from a ten-minute ice bath, a 2k max row, or a long meditation retreat.
→ A brief, repeatable encounter with the edge of physical capability that reframes what the exerciser believes they can tolerate.
Common mistakes
Re-racking between reps
Setting the bar down turns it into ordinary rest-pause volume and removes the point: staying under the load is what forces the limit experience.
Choosing too light a weight
If 20 reps is comfortable, you never reach the edge; the load must genuinely cap you around 10.
Treating it as regular training
It is a limit-testing event, not weekly volume; overusing it invites injury and burnout, especially on a fatigued spine.
Is it for you?
Best for
Trained lifters who want a short, self-contained way to experience and expand their tolerance for discomfort.
Not ideal for
Beginners, anyone with spine or joint issues, or people training for maximal strength rather than capacity.
From the transcript
“A widowmaker is a set of squats with your ten rep marks, and you do 20... you have the bar on your back, you do…”
“You start to go deaf, you have ringing in your ears, taste blood... everything just shuts out and all your cares drop away.”
From the episode
Episode 100 Special Edition Q&A - #100