If you've been wondering whether to focus on cardio or strength training, the short answer is: most people benefit from doing both. Federal guidance recommends at least 150 minutes of moderate-intensity aerobic activity a week—or 75 minutes at vigorous intensity—plus muscle-strengthening activity on at least two days each week. That combination isn't arbitrary; cardio and strength training serve overlapping and distinct roles that work better together than apart. If you're just getting started, you don't need to hit those numbers immediately. The benchmark is a destination, and you can build toward it at a pace that works for you.

Cardio or strength after 45? The short answer

The question tends to assume you have to pick a side, but cardio and strength training aren't rivals—they're complementary. Aerobic activity builds cardiovascular fitness and endurance. Strength training helps maintain muscle and supports bone health. Each fills a gap the other doesn't fully cover, which is why most activity guidelines recommend both rather than one or the other.

That said, the right balance looks different for everyone. Your current activity level, preferences, available equipment, joint comfort and recovery capacity all influence where you start and how you progress. "After 45" describes the readers this article is written for, not a clinical threshold at which the rules of exercise suddenly change.

What cardio contributes

Cardiovascular exercise—anything that raises your heart rate and keeps it elevated for a sustained period—supports heart and lung fitness, builds everyday stamina, and gives you an accessible way to accumulate your weekly aerobic minutes. Options range from brisk walking and cycling to swimming, dancing or low-impact aerobics classes.

One practical advantage of aerobic activity is its flexibility. Sessions can be divided across the week in whatever increments fit your schedule, and they add up toward your weekly total. Weight-bearing aerobic activities like walking and hiking also place load on the skeleton, which overlaps with one of strength training's contributions.

Cardio is not simply a calorie-burning tool, and there is no basis for treating it as inevitably damaging to muscle when done as part of a balanced routine. It is a pillar of overall physical health in its own right.

What strength training contributes

Strength training—using bodyweight, resistance bands, free weights or machines—helps maintain muscle mass and physical function. That becomes increasingly relevant with age: a review reports that muscle mass can decline by approximately 3%–8% per decade after age 30, with losses accelerating after age 60. Strength training is a well-supported approach to helping maintain muscle and physical function as part of an active lifestyle.

Strength training and weight-bearing aerobic activities can also help maintain bone strength as part of an overall bone-health plan. Federal guidance recommends muscle-strengthening activity involving the major muscle groups on at least two days each week.

This article covers only the broad role of strength training in a balanced routine. For detailed guidance on exercises, movement patterns, sets and how to progress, see our complete guide to strength training for women.

Cardio vs strength training: a practical comparison

The table below summarizes how the two modalities differ—and where they overlap.

Feature Cardio Strength training
Primary training effect Cardiovascular and respiratory fitness Muscular strength and endurance
Heart and lung fitness Strong direct benefit Some benefit, especially with circuit-style sessions
Muscular strength Limited direct benefit Strong direct benefit
Bone-loading potential Supported by weight-bearing activities such as walking or hiking Supported by resistance and weight-bearing exercise
Everyday function and stamina Strong benefit Strong benefit
Common beginner options Brisk walking, cycling, swimming, low-impact aerobics Bodyweight exercises, resistance bands, light free weights
Weekly guideline benchmark 150 min moderate or 75 min vigorous, spread across the week At least 2 days involving major muscle groups

Note that these categories aren't rigid. A brisk uphill walk is weight-bearing aerobic exercise that also loads the legs. A fast-paced circuit strength session challenges cardiovascular fitness alongside muscle. In practice, the two modalities often overlap.

What about belly fat and weight management?

This is one of the most common questions in this space, and it deserves a careful answer. Menopause-related hormonal changes may make abdominal fat accumulation more likely, while aging, activity level, diet and genetics also play a role. Body weight and fat distribution are influenced by multiple factors, and no single exercise modality selectively removes fat from one area of the body.

That means there's no reason to choose between cardio and strength on the basis of which one "burns more calories." Both contribute to overall health and physical function, and a consistent balanced routine is more useful than chasing a supposed calorie advantage from one type of training.

Exercise is one meaningful part of managing weight and health, alongside factors such as aging, activity, diet and genetics. For a broader look at menopause-related weight and abdominal-fat changes, see our article on menopause and weight management.

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How to structure a balanced week

The general benchmark—150 minutes of moderate aerobic activity plus muscle strengthening on at least two days—sounds like a lot when you write it out, but it's manageable when you spread it across the week. Here are two non-prescriptive examples to illustrate what that can look like in practice.

Beginner build-up example

This approach suits someone returning to exercise or starting for the first time. The goal is to establish a consistent habit before adding intensity or duration.

  • Monday: 20-minute full-body strength session (bodyweight or light resistance)
  • Tuesday: 20-minute brisk walk
  • Wednesday: Rest or gentle movement such as stretching or a slow walk
  • Thursday: 20-minute full-body strength session
  • Friday: 20-minute brisk walk or low-impact aerobics
  • Saturday: 20–30 minute walk or bike ride at a comfortable pace
  • Sunday: Rest or light activity

This week totals roughly 60–70 minutes of aerobic activity—below the 150-minute benchmark, and that's fine. A beginner can start at a comfortable level and increase duration or frequency gradually over time. The two strength sessions match the recommended frequency of at least two days per week, though fully meeting the guideline also depends on those sessions covering the major muscle groups as recommended.

Time-constrained example

This approach suits someone with a busy schedule who has some exercise experience and wants to work toward the general benchmark. It illustrates one way to reach approximately 150 minutes of moderate aerobic activity across the week by combining shorter sessions with a longer weekend activity.

  • Monday: 30-minute full-body strength session
  • Tuesday: 30-minute brisk walk or cycling
  • Wednesday: 30-minute brisk walk or low-impact class
  • Thursday: 30-minute full-body strength session
  • Friday: 30-minute brisk walk or aerobics
  • Saturday: 60-minute walk, hike or leisure cycling
  • Sunday: Rest or easy stretching

Aerobic sessions across the week total approximately 150 minutes of moderate activity, and two strength days are included. Both examples are illustrations only—not personalized prescriptions.

How to choose your starting balance

Rather than following a formula, consider what's actually true for your situation:

  • Current activity level. If you've been largely sedentary, starting with short, manageable sessions of either type is more sustainable than attempting full guideline volume immediately.
  • Preferences and enjoyment. Exercise you find engaging tends to be easier to sustain over time. If you enjoy swimming but find weight machines unfamiliar, starting there is a reasonable choice.
  • Equipment access. Bodyweight strength exercises and walking require no equipment at all. You don't need a gym to meet either part of the guideline.
  • Joint comfort and mobility. Some people find low-impact aerobic activity more comfortable than others. There's no requirement to run or do high-impact exercise.
  • Recovery and schedule. Placing strength sessions on nonconsecutive days gives muscles time to recover. Our guide to recovery between strength sessions after 45 explains when to add more rest. Factor in your real weekly schedule rather than an ideal one.
  • Where your bigger gap is. If you currently do no strength training at all, adding two sessions is a meaningful shift. If you're rarely active aerobically, that's the priority to address first.

Avoid trying to increase duration, intensity and frequency all at once. Adjusting one variable at a time and allowing your body to adapt before adding more is a more manageable approach to building a lasting habit.

When to get individual advice

If you've been inactive for an extended period, have a chronic health condition, are managing an injury, or have any concerns about whether a particular type of exercise is appropriate for you, it's worth speaking with a qualified healthcare professional before starting or significantly changing your routine. They can offer guidance tailored to your individual health history in a way a general article cannot.

The takeaway

The answer to "cardio or strength?" is almost always both. They serve different purposes, and each fills gaps the other leaves. Federal guidance reflects that by recommending aerobic activity and muscle-strengthening work as separate, complementary components of a healthy week.

The 150-minute aerobic benchmark and two strength days are a destination, not an entry requirement. You can start below those numbers and progress gradually. What matters more than finding the perfect split is building a routine that's consistent, sustainable and appropriate for where you are right now.

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