Some people skip their warm-up completely. They walk into the gym, load up their first exercise and get straight to work.
Others go the other way. Ten minutes turn into twenty. A quick warm-up becomes a long cardio session, endless stretching or a full mobility routine before the workout has even started.
A good warm-up sits somewhere in the middle. It helps you feel ready for the workout ahead without using up energy you want for your working sets.
In this article, you'll learn what a good strength-training warm-up looks like, how long it should take, when stretching can help and how to get ready to lift without wasting time.
Why warming up before strength training is important
A warm-up helps your body gradually get ready for training. Your body temperature rises slightly, your blood flow increases and your heart rate goes up a little.
It could also help you mentally shift into your workout. You can feel how your body is doing that day. Do your muscles feel stiff? Does a joint feel sensitive? Can you get into the positions you need for your exercises?
Think of your warm-up as a safe start. You check in with your body, prepare the movement and build up gradually toward the weight you are going to train with.
A good warm-up can help you:
- move with more control
- start your workout feeling less stiff
- bring your focus to your training
- notice stiffness, pain or limitations in time
- practice the exercise before the weight gets heavy
- feel prepared without getting tired
Skipping your warm-up does not automatically mean something will go wrong. But your first exercise may feel stiffer, heavier or less controlled. The goal is not to do a lot. The goal is to do what is needed.
A simple warm-up structure
For most strength workouts, 5 to 10 minutes of easy cardio is enough. In my opinion, the cross trainer is often the best general choice, because you use both your legs and your arms. This means many of the muscles you will use later have already been active, whether you move on to a deadlift, chest press, pulldown, squat or another strength exercise.
A treadmill, bike or some form of cardio can also work well. The most important thing is that your heart rate goes up slightly and your body starts to feel warmer. You should still be able to talk. If you are out of breath or your legs already feel tired, you are doing a bit much for a warm-up.
After those 5 to 10 minutes, do the specific strength exercise with a lighter weight. In 9 out of 10 cases, that is already enough preparation. You do not need to automatically add stretching or activation exercises. Stretching can be useful, but only if it solves something for your body or your exercise.
Step 1: start with 5 to 10 minutes of easy cardio
Start on a cardio machine. The cross trainer is usually a good option because it gets your whole body moving gently. You use your legs, arms and upper body without the effort needing to be heavy.
Trainer’s tip: The warm-up is not your conditioning workout. The goal is not to burn calories or challenge yourself. The goal is to prepare your body for strength training.
Step 2: test the movement you are about to train
After the short general warm-up, check if your body is ready for the movement you are going to do. Often, the best preparation is the exercise itself, but lighter.
Going to squat? Do a few bodyweight squats first. If you can get into position, build up with light squat sets. If you cannot get deep enough because your ankles feel stiff, do a short ankle mobility drill and test again.
Going to deadlift? If you can pick up the bar or a light weight from the floor with good control, you do not need to automatically add extra exercises. The light deadlift itself can already be your warm-up. Trouble reaching the bar without rounding your lower back? Stretch the glutes and hamstrings and test again.
Going to bench press or chest press? Start with an empty bar or light weight. If your shoulder position feels good and controlled, continue building up.
The idea is simple: test the movement first. Only add something extra if you notice that something does not feel good or you cannot get into the right position.
If you regularly struggle to get into the right position for an exercise, a personal trainer can help you assess your technique and find the right approach for your body.
Step 3: use warm-up sets with a lighter weight
Warm-up sets are often the most important part of a strength training warm-up. You do the same exercise you will train heavily, but with a lighter weight.
This prepares your muscles, technique, and focus. You feel how the exercise moves that day before your working sets.
For example, if your working weight on the leg press is 100 kg, you could build up like this:
- 40 kg for 10 reps
- 70 kg for 5 to 10 reps
- then start your working sets at 100 kg
But warm-up sets should not make you tired. They should prepare you, not drain you. If 70 kg already starts to feel heavy at 5 or 6 reps, stop there. Do not turn it into 10 reps just because you think that is needed to get warm.
Once you feel a burn or notice that you are losing strength, your warm-up is starting to take away from your working sets. The goal is to make your working sets more effective, not to arrive at them already fatigued.
Do you need cardio before strength training?
A short cardio warm-up can be useful before strength training, as long as you keep it short and easy. Five to ten minutes is usually enough to raise your heart rate slightly and make your body feel warmer.
But if you walk to the gym? Skip the cardio and start with warm up sets or stretching (only when necessary).
If strength training is your main goal, do not turn your warm-up into a long cardio session. Twenty or thirty minutes of cardio can be fine if that is your goal, but right before heavy strength training it can also make your working sets less effective.
Examples of practical warm-ups
The basics stay the same: warm up generally, then perform the exercise itself with a lighter weight. Only do more if you really need it.
Lower body
Start with 5 to 10 minutes of easy cardio, preferably on the cross trainer. Going to squat or leg press? Test the movement with bodyweight squats, an empty bar or a light weight. If it feels good, build up with lighter sets of the exercise you are about to train. Check hip, knee and ankle mobility.
Upper body
Start with 5 to 10 minutes of easy cardio. On the cross trainer, your arms, shoulders, and back have already been lightly active. Then start your first upper-body exercise with a lighter weight. Check shoulders and elbows.
Full-body training
Start with 5 to 10 minutes on the crosstrainer. Warm up set(s) before every exercise, check every joint: Ankle, knee, hip, shoulder and elbow.
Common warm-up mistakes
1. Skipping the warm-up completely
Starting heavy straight away can make the first exercise feel stiff, heavy or less controlled. Do at least a short general warm-up and a few lighter sets.
2. Warming up for too long
Long cardio, too much stretching and many separate exercises can take time and energy that you could use for your working sets. Keep your warm-up focused on the workout that follows.
3. Making warm-up sets too heavy
A warm-up set is not a working set. If you already feel a burn or feel like you have to work hard, the set is too heavy or too long. Stop in time so you have energy left for your real sets.
4. Only doing general cardio
A few minutes of cardio makes you warmer, but it does not always prepare your body for the specific exercise. That is why you should also use light sets of the movement you are going to train.
5. Stretching without a specific reason
Stretching can be useful, but not every workout needs a complete mobility routine. Add stretching or mobility exercises only if they help you get into a better position.
A simple way to tell is this: if you can perform the exercise with good technique and move through a comfortable range of motion, you probably don't need to stretch first. If a joint feels stiff or you struggle to get into the right position, a short stretch or mobility exercise may help before you start.
Bonus information about stretching
Static stretching can make you feel more flexible in the moment. If you hold a stretch, your body may temporarily allow a little more range of motion. That can be useful, but it does not always mean you are building long-term mobility.
- Static stretching mainly teaches your body to tolerate a stretched position for a short period of time.
- Strength training through a full range of motion teaches your body to control that position under load.
That is a big difference.
For example, a controlled squat, Romanian deadlift, split squat or pulldown does not only bring the muscle into a lengthened position. The muscle will stay active, strong and controlled in that position.
Over time, this can help you build mobility you can use during training.
Simple rule: static stretching can help you feel more open now. Full-range strength training helps you build mobility you can use.
Warm-up checklist
Before your next strength workout, check:
- Did I move easily for 5 to 10 minutes?
- Does my body feel warmer, but not tired?
- Did I check how my body feels today?
- Can I get into a good position for my next exercise?
- Did I build up the exercise with a lighter weight?
- Are my warm-up sets easy enough not to affect my working sets?
If the answer is yes, your warm-up is doing its job.
Conclusion
A good warm-up does not need to be long or complicated. It should help you start your workout warmer, more focused and better prepared.
The basic structure is simple: do 5 to 10 minutes of easy cardio, preferably on the cross trainer, test the movement you are about to train and then build up with light warm-up sets.
Stretching, mobility work or extra exercises are only needed if they help you get into a better position. Warm up to make your training more effective, not to make yourself tired before you start.
Ready to put these tips into practice? Open the Basic-Fit app and try your next workout.
Disclaimer: This article is for informational purposes only and does not replace professional advice. Individual needs may vary depending on your health and experience level. Consult a professional if you have specific questions.
