Exercise Goals, Part 1: How Much Exercise Is Enough?
Have you ever asked yourself, "Am I doing enough?" Or, "Am I doing too much?" You're not alone.
Finding the right balance with exercise can be challenging, whether you're just getting started, returning after an injury or trying to optimize your current routine. Understanding the fundamentals of physical activity is key to long-term health, consistency and injury prevention.
The core parameters of exercise
Every effective exercise program is built on three foundational variables: intensity, duration and frequency. Think of these as building blocks that, when properly balanced, create a sustainable and effective routine.
Intensity: how hard are you working?
Intensity refers to how much effort your body is putting out during exercise. One of the most common mistakes we see is going too hard, too soon, which often leads to burnout or injury. Current physical activity guidelines recommend:
- 150 minutes of moderate-intensity aerobic activity per week, or
- 75 minutes of vigorous-intensity aerobic activity per week
This can be broken into manageable sessions, such as 30 minutes, five days per week.
Measuring intensity
For aerobic exercise, intensity can be measured with heart rate zones or your rate of perceived exertion (RPE). As a general guide:
- Light intensity: easy effort, comfortable conversation
- Moderate intensity: breathing harder, conversation becomes limited
- Vigorous intensity: challenging effort, conversation is difficult
For strength training, intensity relates to the amount of resistance used relative to your maximum capacity. A good starting point is a weight that lets you complete 10–15 controlled repetitions, with the last few reps feeling challenging but manageable. Aim for at least 60 minutes of strength training per week.
Duration: how long are you exercising?
Duration simply refers to how long each workout lasts. While longer sessions have their place, consistency matters more than perfection. A 20-minute walk is far more beneficial than a planned 60-minute workout that never happens.
Frequency: how often do you exercise?
Frequency refers to how often you exercise each week and should be adjusted in relation to intensity and duration. Here are examples that meet current guidelines:
| Type | Option A | Option B |
|---|---|---|
| Aerobic | 30 minutes of moderate intensity, 5 days per week (150 minutes) | 15 minutes of vigorous intensity, 5 days per week (75 minutes) |
| Strength training (60 minutes total) | 30 minutes, 2 days per week | 20 minutes, 3 days per week |
Using the SMART-ER framework for goal setting
Setting the right goals can make the difference between short-term motivation and long-term success. Try the SMART-ER framework:
- Specific: instead of "get in shape," try "walk briskly for 30 minutes, 5 days per week"
- Measurable: track progress with metrics like minutes exercised, weights lifted or steps taken
- Achievable: your goals should challenge you without being unrealistic for your current abilities
- Relevant: choose goals that fit your lifestyle and preferences; if you hate running, don't make it your main focus
- Time-bound: set deadlines to help assess progress and stay accountable
- Exciting: goals should motivate you, not feel like punishment
- Reviewed: regularly reassess and adjust goals as your fitness, schedule and priorities change
Final thoughts
Getting started is often half the battle. Staying consistent is the next challenge, but building a routine that balances intensity, duration and frequency makes that process far easier. In Part 2, we'll cover the habit hacks that keep you going.
Returning after an injury or not sure where to start? Our physical therapists can help you find the right starting point and progress safely.
book a sessionthe takeaway
Aim for 150 minutes of moderate or 75 minutes of vigorous aerobic activity a week, plus regular strength training, and balance intensity, duration and frequency so you don't do too much too soon. Set SMART-ER goals and remember that consistency beats long workouts that never happen.
Frequently asked questions
How much exercise do I need each week?
Current guidelines recommend 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity aerobic activity per week, which can be split into sessions such as 30 minutes, five days a week.
How can I tell if I'm exercising at moderate intensity?
At moderate intensity you're breathing harder and conversation becomes limited. At light intensity you can talk comfortably, and at vigorous intensity conversation is difficult.
How heavy should I lift when starting strength training?
Choose a weight that lets you complete 10–15 controlled repetitions, with the last few reps feeling challenging but manageable.
What does SMART-ER stand for?
Specific, measurable, achievable, relevant, time-bound, exciting and reviewed: a framework for setting goals you'll actually stick with.
