What are ultradian rhythms?

Ultradian rhythms are 90-120 minute cycles that govern your body's natural energy and focus patterns throughout the day. Unlike circadian rhythms (24-hour cycles), ultradian rhythms repeat multiple times daily and determine when you're at peak cognitive performance versus when you need recovery.

How does Ultradia work?

Ultradia structures your workday around 90-minute focused sprints followed by 20-minute recovery periods. You commit to specific tasks at the start of each sprint, execute with a timer, and track your progress. The community accountability feature lets you see what others in your circle are working on in real-time.

Ultradia is built first for real-estate agents, sales pros, and solo operators whose income depends on doing the work — and for any self-driven professional who does better with people in the room. If you struggle with distraction, procrastination, or staying consistent on your highest-value work, it's built for you.

How is Ultradia different from Pomodoro or time-blocking?

Unlike Pomodoro's 25-minute intervals, Ultradia uses 90-minute cycles aligned with your brain's natural focus rhythms. Unlike solo time-blocking, Ultradia adds community accountability—you can see what others are executing and be seen. This social commitment dramatically increases follow-through on your daily commitments.

How many 90-minute sprints can I do in a day?

Most people start with two and build up to four to six over several weeks. Research on elite performers suggests around four hours of truly focused work per day is a realistic ceiling, so prioritize quality of focus over the number of sprints.

What if I lose focus before the 90 minutes are up?

Note the distraction on paper and return to the task. If 90 minutes feels too long at first, start with 60-minute sprints and extend as your focus capacity grows. Consistency builds the muscle.

Is 90 minutes too long compared to the Pomodoro Technique?

It depends on the work. Pomodoro's 25-minute intervals are great for shallow tasks and beating procrastination, but deep, complex work benefits from longer blocks that let you reach and sustain flow — which is what 90-minute sprints are built for.

Do I really need a break between sprints?

Yes. The recovery break clears fatigue and helps your brain consolidate focus. Working through it leads to diminishing returns and burnout, which defeats the purpose of the method.

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How to Work in 90-Minute Sprints: A Practical Guide

Name: Ultradia
Rating: 4.8 (127 reviews)
Author: Pete Moulton

Pete MoultonMay 12, 20266 min read

To work in 90-minute sprints, pick one task, set a timer for 90 minutes, and protect that block from interruptions — no email, no messages, no task-switching. Work until the timer ends, then take a genuine 15–20 minute recovery break before the next sprint. The 90-minute length mirrors your brain's natural ultradian cycle, so you reach deep focus and stop before burnout sets in.

~90 min

Length of one natural focus-and-recovery cycle

Source: Kleitman, Basic Rest-Activity Cycle

~4 hrs

Daily focused-practice ceiling seen in elite performers

Source: Ericsson et al., 1993

Why 90 minutes?

Sleep scientist Nathaniel Kleitman identified a roughly 90-minute cycle that the brain moves through during sleep — the Basic Rest-Activity Cycle (BRAC). Later research found the same rhythm continues during waking hours: every 90 minutes or so, your capacity for focus rises, peaks, and then naturally declines.

A 90-minute sprint is long enough to reach a state of deep concentration and actually finish meaningful work, but short enough that you stop before your brain forces a decline. You are working with your biology instead of pushing against it.

How to run a single sprint

A focus sprint is simple, but the details matter. Run it like this:

✓Choose one outcome — a single task you want to finish, not a vague category of work.
✓Silence notifications. Close email, messages, and any tab that isn't the work.
✓Set a 90-minute timer and begin immediately.
✓Single-task. If a distraction pops into your head, jot it on paper and keep going.
✓Stop when the timer ends, even mid-thought. The boundary is what makes the system repeatable.

The recovery break is part of the method

The 15–20 minute break after a sprint is not optional — it is where the method does half its work. Step away from screens, move your body, get daylight if you can. Recovery clears mental fatigue, lets your attention reset, and helps consolidate what you just did.

Skipping recovery is how people burn out and conclude that 'deep work doesn't work for them.' The break is what makes the next sprint possible.

Building up to a full sprint day

Don't try to do six sprints on day one. Most people start with two sprints a day and add one each week as their focus capacity grows. Anders Ericsson's research on elite performers found that even world-class experts cap deliberate, focused practice at around four hours a day — quality of focus beats raw hours.

Sprints also get easier with accountability. Working a sprint alongside other people — in a coworking room or with a partner — makes the commitment visible and far easier to keep.