Zone 2 and breathless intervals: how experts build the cardio week
October 13, 2026 · 25 min read
Huberman's fitness tools start from 150 to 200 minutes of zone 2 cardio a week and add harder sessions, Rhonda Patrick swaps 10,000 steps for 10 breathless minutes, Stacy Sims tells women to polarize their training and sprint briefly, and Vonda Wright's routine pairs walking with sprinting. Seeing how each of them combines easy and hard work helps a reader spend limited cardio time well.
The rules, numbers and steps worth keeping in front of you.
- Huberman: aim for 150 to 200 minutes of zone 2 a week, at a pace where you can still hold a conversation.
- Galpin: collect zone 2 from daily life by walking briskly, carrying groceries, walking meetings and pacing on phone calls.
- Huberman's week: one long endurance session, one moderate faster session and one all-out interval session.
- Patrick: ten breathless minutes a day, which can be three minutes after breakfast, lunch and dinner.
- Patrick's talk test: at vigorous intensity you can say only a few words before taking a breath.
- Patrick: one vigorous minute equals about four moderate minutes or about 53 light minutes for all-cause mortality.
- Sims: sprint 30 seconds or less, all out, then recover fully; no more than five, and two done properly count.
- Sims: women from perimenopause onward should leave moderate intensity out, even an easy 5K jog.
- Wright: at least three hours of brisk walking a week, plus four 30-second sprints twice a week.
- Galpin's hard-day minimum: about four rounds of 30 seconds on and 30 off, truly near 100 percent.
- Galpin: avoid four to six hard days a week, which can bring hormonal and sleep problems.
- Huberman: keep the interval day two or three days away from leg day.
- Sims: women should eat before morning exercise, even before a walk.
- Warning: with a heart condition, an injury or a long break from exercise, take a doctor's advice before all-out intervals.
This is the short form. The full insight has every expert's reasoning, their own words and the sources.