The Minimum Effective Dose: a training system for people with no time

Every failed fitness plan dies the same death. You design it for your best week — the week with no travel, no sick kid, no 7 a.m. call — and then you live your actual weeks. You miss Tuesday, the plan's "broken," and the identity quietly follows: I'm not doing the program anymore. Two months later you start over from zero.

The public-health baseline is not ambitious: CDC and WHO guidelines call for roughly 150–300 minutes of moderate activity a week (or 75–150 vigorous), plus two days of strength work. Yet CDC data shows only about half of US adults hit even the aerobic half of that. The gap isn't knowledge or willpower. It's programming that treats a missed session as failure instead of a design input.

The fix is the same one we use everywhere else on this site: stop optimizing the ceiling, engineer the floor. We built attention architecture on that idea, and the Money OS runs on it. This is the physical version — the Minimum Effective Dose system. Three tiers, one metric, zero decisions made at 6 a.m.

Step 1: Define your three tiers

The core move: instead of one workout that you either do or skip, every session exists in three sizes. You choose the size based on the day you're actually having — but you never choose zero.

• Tier 1 — The Floor (10 minutes). Non-negotiable, equipment-free, doable in a hotel room or a hallway. One circuit: squats, push-ups (or incline push-ups), a hinge (glute bridge), and a 60-second brisk walk or stair climb. Its job is not fitness. Its job is keeping the streak — and the identity — alive.
• Tier 2 — The Standard (20–30 minutes). The default. Three rounds of a five-movement circuit (below), or a 25-minute brisk walk/run/ride at a pace where talking is possible but singing isn't. This is the tier that actually accumulates your weekly minutes.
• Tier 3 — The Full Session (45–60 minutes). The version your old plan was built entirely out of. Now it's a bonus, not a requirement: a real gym session, a long run, a hard hike. Two of these a week is a great week — but a week with none can still be a passing week.

Write your three tiers down — literally, one card or phone note. The 6 a.m. decision is no longer "do I train today?" It's "which size?" That's a decision you can win while exhausted.

Step 2: The Standard session — one circuit, five patterns

You don't need a program, you need coverage of the five human movement patterns. One dumbbell or kettlebell covers all of them; so does bodyweight with a backpack of books.

1. Squat — goblet squat or bodyweight squat, 8–12 reps
2. Push — push-up variation or overhead press, 8–12 reps
3. Pull — one-arm row or band row, 8–12 per side
4. Hinge — Romanian deadlift or glute bridge, 8–12 reps
5. Carry — walk 30–45 seconds holding the weight at your side, switch hands

Run it as a circuit: minimal rest between movements, 60–90 seconds between rounds, three rounds. That's roughly 20 minutes, strength boxes ticked. Do it twice a week and you've met the strength guideline; fill the remaining days with Tier 1–2 aerobic work and the weekly minutes take care of themselves.

Step 3: Schedule with if-then scripts, not intentions

Sessions that live "sometime today" die by 3 p.m. Anchor each one to an existing event and pre-decide the fallback:

• "After I pour my first coffee, I do the Standard circuit."
• "If a morning meeting lands on my slot, the session becomes Tier 1 before lunch — automatically, no renegotiation."
• "If I'm traveling, the hotel-room Floor counts. Full credit."
• "If it's dangerously hot out" — this week's heat dome is a live case study — "hard efforts move to early morning or move indoors. The World Cup rescheduled its physiology; so can you."

Put the anchor slots in your calendar once, on Sunday. This pairs naturally with the 30-minute weekly review: while you're planning the week, size each day's session against what the calendar actually shows.

Step 4: Keep one scoreboard — sessions, not outcomes

Track exactly one number: sessions this week, where any tier counts as one. Target five. Not weight, not pace, not what the watch says about your "readiness." Outcome metrics lag by months and punish you during the exact stretches — bad sleep, travel, stress — when showing up matters most. A wall calendar and an X is genuinely enough. Score four or five for six straight weeks before you let yourself care about any other number.

Worked examples

The parent with 20 minutes, max

Anchor: kid's nap or the 20 minutes after bedtime. Monday/Thursday: Standard circuit in the living room. Tuesday/Saturday: Tier 2 walk with the stroller or a podcast. Wednesday: Floor by default. Five sessions, zero commute, no gym membership. The dumbbell lives next to the couch — friction is the real opponent.

The road warrior

Rule: travel days are automatic Floor days — ten minutes in the room before checking email, no exceptions and no guilt. Home days are Standard by default. A 3-travel-day week still scores five sessions. The old program scored that week zero and called it a relapse.

The desk-bound overachiever

The failure mode here is the opposite: turning every session into Tier 3 until week four ends in soreness, a skipped week, and a restart. Prescription: cap Tier 3 at two per week, force the other three to stay small, and treat the cap as seriously as the floor. Recovery is where the adaptation happens — which is why the sleep protocol is the silent second half of this playbook.

Progression: turn one knob per week

When the Standard circuit stops feeling challenging, change exactly one variable: add a round, add 2 reps per movement, add weight, or shave rest. One knob, once a week. If you changed two things, you can't tell what worked — same rule we use in the $2 Test for agent stacks: cheap, reversible experiments beat grand redesigns.

Failure modes (and the patch)

• All-or-nothing relapse. You miss two days and declare bankruptcy. Patch: the streak rule is "never miss twice," and a Floor session fully repairs the streak.
• Program hopping. New plan every three weeks, progress resets each time. Patch: you're allowed to change programs only after six consecutive weeks of 4+ sessions.
• Soreness chasing. Rating workouts by how wrecked you feel. Patch: rate them by whether you'd repeat tomorrow. Sustainable beats heroic.
• Gear stalling. "I'll start once I buy X." Patch: the Floor requires a floor. You already own one.
• Metric creep. Wearable says you're 62% recovered, so you skip. Patch: the watch doesn't vote on Tier 1. Nothing vetoes ten minutes.

The one-card version

• Three tiers: 10-minute Floor, 20-minute Standard, full session as bonus.
• Five movement patterns per strength session: squat, push, pull, hinge, carry.
• Anchor slots on the calendar Sunday; if-then fallbacks pre-decided.
• One scoreboard: sessions per week, any tier counts, target five.
• Never miss twice. One knob per week. Six weeks before changing anything.