Understand your training
Fitness
How strength, muscle and conditioning really work — without the myths.
Fitness is full of conflicting advice. This section cuts through it: how many sets build muscle, how heavy you need to lift, how long to rest, and how much exercise you actually need for health — explained in plain English and referenced to the research.
Whether you are brand new to training or have lifted for years, start with the basics below, then use the guides to turn what you have learned into a plan.
New here?
Start here
How Much Exercise Do You Actually Need? What the WHO Guidelines Say
The global minimums for cardio and strength training, translated into a week you can actually schedule — plus an 8-week starter plan.
Progressive Overload: The One Principle Behind Every Program That Works
Why your body only changes when you ask it to do a little more — and five practical ways to do it.
The Minimum Effective Dose: Getting Stronger When You're Short on Time
Busy week? Research suggests a surprisingly small amount of training can still build strength.
Guides & programs
All Fitness articles
Browse in the Journal →How Much Exercise Do You Actually Need? What the WHO Guidelines Say
The global minimums for cardio and strength training, translated into a week you can actually schedule — plus an 8-week starter plan.
Progressive Overload: The One Principle Behind Every Program That Works
Why your body only changes when you ask it to do a little more — and five practical ways to do it.
How Many Sets Do You Need to Build Muscle?
What the research on weekly training volume says, how to count your sets, and sample weekly plans for every level.
Heavy vs Light Weights: Which Builds More Muscle?
Good news for home trainers — light weights can build as much muscle as heavy ones, if you train them right.
How Long Should You Rest Between Sets?
Short rests feel productive, but the research suggests longer breaks may build more strength and muscle.
How Often Should You Train Each Muscle?
Once a week "bro splits" vs full-body training — here's what the research says about frequency.
The 8-Minute Warm-Up That Actually Works
Skip the long static stretches. Here's a research-informed warm-up that prepares you to perform.
How Many Steps a Day Do You Really Need?
Is 10,000 steps a myth? A large 2022 analysis gives a clearer, age-specific answer — plus a 6-week plan to add steps.
Why Strength Training Might Be the Best Thing You Do for Your Future Self
Muscle isn't just about looks. What large studies link to regular strength training, how little you need, and a 12-week starter plan.
The Minimum Effective Dose: Getting Stronger When You're Short on Time
Busy week? Research suggests a surprisingly small amount of training can still build strength.
Common questions
How much exercise do I need each week?
The World Health Organization recommends at least 150–300 minutes of moderate activity (or 75–150 minutes of vigorous activity) a week for adults, plus muscle-strengthening work on two or more days. Our article on how much exercise you need breaks this down into a realistic weekly plan.
Do I need a gym to get stronger?
No. Bodyweight and dumbbell training can build real strength and muscle, as long as the work gets gradually harder over time. Our home programs are built around exactly that.
I am a complete beginner. Where should I start?
Read the three articles under "Start here", then try the free 7-Day Kickstart Plan. It introduces the main movement patterns with short, manageable sessions.
Not sure where to begin?
Answer a few quick questions and get a free personalised plan with calorie targets, a weekly training schedule and meal ideas.