Most adults need about 30 minutes of moderate-intensity cardio per day, five days a week. That adds up to 150 minutes weekly, the baseline recommended by the CDC, the WHO, and most major health organizations. If you prefer harder workouts like running or cycling at a challenging pace, you can cut that nearly in half: 75 minutes per week, or roughly 15 minutes a day, five days a week.
Those numbers are minimums for general health. Your ideal daily amount depends on your goals, your fitness level, and the intensity you’re working at.
The Baseline: 150 Minutes Per Week
The standard recommendation for adults is 150 minutes of moderate-intensity aerobic activity per week. A brisk walk, an easy bike ride, or a casual swim all count. The simplest way to hit that target is 30 minutes a day, five days a week, though you can split it up however you like. Three 50-minute sessions work just as well as five 30-minute ones.
If you do vigorous-intensity cardio instead, like jogging, running, or fast-paced cycling, 75 minutes per week provides equivalent benefits. You can also mix the two: a 20-minute jog on Tuesday plus a 40-minute walk on Thursday, for example. One minute of vigorous activity roughly equals two minutes of moderate activity.
How to Tell Moderate From Vigorous
Moderate intensity means your heart rate sits at about 50% to 70% of your maximum. A quick way to estimate your max heart rate is to subtract your age from 220. So if you’re 40, your max is around 180 beats per minute, and moderate intensity would put you between 90 and 126 bpm. The practical test: you can hold a conversation but couldn’t sing a song.
Vigorous intensity pushes your heart rate to 70% to 85% of your max. At this level, you can only get out a few words before needing a breath. Running, swimming laps, and high-intensity group fitness classes typically fall into this range.
If Your Goal Is Weight Loss
For weight management, you’ll likely need more than the baseline. The Mayo Clinic recommends aiming for 300 minutes per week of moderate cardio, or 150 minutes of vigorous cardio, for meaningful weight loss or maintaining lost weight. That works out to about 60 minutes of moderate activity most days, or 30 minutes of vigorous activity five days a week.
This doesn’t all have to come from structured exercise. Walking to run errands, taking the stairs, or doing yard work all contribute to your weekly total. The key is consistency over time rather than cramming everything into one or two long sessions.
Where HIIT Fits In
High-intensity interval training is efficient but not something you should do every day. Research on recreational runners found that two to three HIIT sessions per week improved cardiovascular fitness, with no clear additional benefit from a third session compared to two. Twice-weekly HIIT appears to strike the best balance between results, recovery, and the ability to stick with it long term.
A typical effective HIIT structure involves four rounds of 4-minute hard efforts with recovery periods in between. That means a single session can be done in under 30 minutes. You can fill the rest of your weekly cardio with lower-intensity work like walking or easy cycling.
Signs You’re Doing Too Much
More cardio isn’t always better. Overtraining syndrome is a real condition that develops when training volume consistently outpaces recovery. It’s especially common in endurance athletes and people who do high volumes of aerobic exercise.
The warning signs for people who do primarily cardio include persistent fatigue, depression, loss of motivation, heavy or sore muscles that don’t improve with rest, waking up feeling unrefreshed, and difficulty concentrating. Performance declines that last weeks to months despite rest are a hallmark. The underlying mechanism involves chronic inflammation that affects the brain and hormonal systems, triggering what researchers describe as “sickness behavior,” including poor appetite, disrupted sleep, and low mood.
Overtrained athletes also get sick more often. Excessive training shifts the immune system in a way that reduces your body’s ability to fight off respiratory infections. If you’re catching every cold that goes around and your workouts feel harder than they should, that combination is worth paying attention to.
Guidelines for Adults Over 65
The CDC recommends the same 150 minutes of moderate cardio per week for adults 65 and older. That can look like 30 minutes a day, five days a week, of brisk walking or similar activity. The 75-minute vigorous option also applies, though fewer older adults work at that intensity.
The most important principle for this age group is that some activity is better than none. If 150 minutes feels out of reach due to health conditions or mobility limitations, doing whatever amount you can still provides measurable benefits for heart health, balance, and cognitive function.
A Practical Weekly Framework
For most people, a sensible week of cardio looks something like this:
- General health: 30 minutes of moderate cardio, 5 days per week
- Weight management: 45 to 60 minutes of moderate cardio, 5 days per week, or 30 minutes of vigorous cardio, 5 days per week
- Time-efficient approach: 2 HIIT sessions (20 to 30 minutes each) plus 2 to 3 moderate sessions to reach your weekly target
Rest days matter. Even if you enjoy daily exercise, alternating harder and easier days gives your cardiovascular system and joints time to adapt. Building in at least one or two full rest or very light activity days per week helps prevent the creep toward overtraining, especially if you’re also doing strength training alongside your cardio.