Physiological Sigh vs Box Breathing
A double-inhale reset versus four equal sides with two holds.
How they differ
The physiological sigh is two inhales — 2 seconds, then 1 second — followed by a 6-second exhale (9-second cycle, ~6.67 breaths/min). Default session: three minutes. Box breathing is four equal 4-second phases with two holds (16-second cycle, 3.75 breaths/min) and a square-orbit visual. Default session: five minutes. Focus breathing uses the same 4-4-4-4 counts as box with a block visual and a two-minute default — that is a purpose/duration choice, not the same compare as sigh vs box.
How to choose
- For a quick double-inhale reset, start the physiological sigh.
- For equal sides and a square to follow, start box breathing.
- For the same box counts with a shorter default, start focus breathing.
- Build your own counts on the custom timer.
When people use them
People compare these when they want a structured reset but are choosing between a brief double inhale and a longer equal-sided cycle. These are timers, not clinical protocols. More short-reset tools: breathing for focus or breathing for work.
Pattern data
- Physiological sigh 2+1+6: cycle 9 seconds, ~6.67 breaths per minute, 3-minute default.
- Box 4-4-4-4: cycle 16 seconds, 3.75 breaths per minute, 5-minute default.
- Sigh has no holds; box has two 4-second holds.
Physiological Sigh
Pattern data
- INHALE
- 2 sec
- INHALE +
- 1 sec
- EXHALE
- 6 sec
- Cycle
- 9 sec
- Cycles / min
- ~6.67
- Session cycles
- ~20
Box Breathing
Pattern data
- INHALE
- 4 sec
- HOLD
- 4 sec
- EXHALE
- 4 sec
- HOLD
- 4 sec
- Cycle
- 16 sec
- Cycles / min
- ~3.75
- Session cycles
- ~18
FAQ
Which pattern is shorter per cycle?
The physiological sigh is a 9-second cycle. Box is 16 seconds.
Which has the shorter default session?
Physiological sigh defaults to three minutes. Box defaults to five minutes.
Is the physiological sigh the same as focus breathing?
No. Focus breathing is 4-4-4-4 with a block visual. The sigh is a double inhale and long exhale.
Is this medical advice?
No. breathinglab.app provides informational breathing tools and does not provide medical advice.
Stop and return to normal breathing if you feel dizzy, lightheaded or uncomfortable. The stacked inhales and breath holds are optional.