Do You Need to Warm Up Before a Workout? (UK 2026)

You have 45 minutes and a plan to follow, and it is tempting to skip straight to the hard part. So is a warm-up really worth the time, or is it a habit you can quietly drop? For most people the answer is that a few minutes of preparation is worth it, and the cost of doing it is small. Here is what a warm-up actually does, when it matters most, and a simple routine you can run in five minutes.

Do you actually need to warm up?

For most people, most of the time, yes. A short warm-up gradually raises your heart rate and breathing, lifts the temperature of your muscles, and eases your joints through a wider range of motion before you ask them to work hard. It also gives your nervous system a moment to switch on, so the first few reps or strides feel smoother rather than jarring.

Is it compulsory? No. Plenty of people train without one and come to no harm. But a warm-up is one of the rare things in fitness with clear upside and very little cost. Skipping it to save five minutes rarely pays off, especially before heavy lifting, sprinting or anything explosive.

What does a warm-up actually do to your body?

A good warm-up works on several fronts at once:

• It raises muscle temperature, which helps your muscles contract and relax more quickly. Warmer muscle tends to produce force faster, which is why speed and power efforts in particular feel better after a proper warm-up.
• It increases blood flow to the working muscles, so oxygen is delivered more readily as the effort ramps up.
• It improves your available range of motion, so movements like a deep squat or a long stride feel less restricted.
• It primes the nervous system, sharpening coordination and the timing of muscle activation.
• It gives you a mental run-up, a few minutes to shift from your day into the session ahead.

Research consistently links a rise in muscle temperature with better fast, powerful movements. The picture for maximum strength is more modest, but the readiness and range-of-motion benefits alone make a short warm-up worthwhile.

Can you skip the warm-up?

Here is the honest version. The evidence that warming up prevents injury is mixed. Reviews of the better studies tend to lean slightly in favour of a lower injury risk, but they stop short of a firm promise, and some studies found no clear effect. Structured, movement-based warm-ups used in team sport, such as the widely studied FIFA 11+ programme, have shown more encouraging results for reducing lower-limb injuries, but that is a specific programme rather than proof that any warm-up protects everyone.

So we will not overclaim. What we can say is that a warm-up reliably makes you feel readier and often helps performance, and it costs very little. For a light, easy session you can get away with easing in slowly and treating the first few minutes as the warm-up itself. Before heavy, fast or competitive efforts, a proper warm-up is the sensible default.

What does a good warm-up include?

Think of it in three simple stages:

• Raise the pulse. Two to three minutes of easy cardio: a brisk walk, a gentle jog, an easy spin on a bike or a few minutes on a rower. You want to feel warmer and slightly out of breath, not tired.
• Move dynamically. Controlled movements that take your joints through their range and rehearse the patterns you are about to use: leg swings, walking lunges, hip circles, arm swings, bodyweight squats and gentle torso rotations.
• Rehearse the session. Make the last part of the warm-up look like the first part of the workout, only lighter. Runners add a few short, faster strides. Lifters do lighter warm-up sets. This is where a general warm-up becomes specific to what you are about to do.

Dynamic or static stretching, which comes first?

This is the part people get tangled up in. Dynamic stretching means moving through a range, such as leg swings and lunges. Static stretching means holding a lengthened position still, such as sitting and reaching towards your toes.

For the warm-up, choose dynamic. Moving through range warms the tissue and prepares the movement without dulling your output. Long static holds are best saved for after your session, or for separate mobility work on their own.

The reason is that long static holds right before heavy or explosive work can slightly blunt strength and power for a short while. The dips seen in studies are usually small, and a brief hold of one stubborn muscle is unlikely to ruin your session. But as a simple rule, move to warm up, and save the long holds for later.

How should you warm up for running, lifting and HIIT?

The three-stage idea stays the same. What changes is the rehearsal at the end.

• Running. Start with an easy walk or slow jog for a few minutes, add leg swings and a few walking lunges, then finish with three or four short strides that build towards your session pace. For an easy run you can simply start slowly and let the first kilometre be the warm-up.
• Lifting. Raise the pulse briefly, add mobility for the joints you are about to load, such as hips and shoulders, then do warm-up sets. Start with the empty bar or a light weight and build up over a few sets to your first working weight. This rehearses the exact movement and lets you check your technique.
• HIIT. Because HIIT throws you into hard efforts quickly, the build matters. Spend a few minutes gradually lifting the intensity and practising the movements at an easy pace, so your first hard interval is a step up rather than a shock. A cold start into an all-out effort is where HIIT feels worst.

What does a simple five-minute warm-up look like?

Short on time? This general routine suits most sessions. Adjust the last minute to match what you are about to do.

• Minutes 1 to 2: easy cardio. A brisk walk, gentle jog or easy bike to lift the pulse.
• Minute 3: dynamic lower body. Ten leg swings each side, ten walking lunges, ten bodyweight squats.
• Minute 4: dynamic upper body and hips. Arm swings, hip circles and gentle torso rotations.
• Minute 5: rehearse the session. A few strides before a run, or the first light warm-up sets before lifting.

Five focused minutes covers the essentials. Give yourself longer before heavy lifting, sprint work or a race.

What about cooling down?

A cooldown is worth a brief mention. A few minutes of easy movement after training helps you wind down gradually rather than stopping dead. Gentle static stretching afterwards can feel good and is a fine time to work on flexibility, while your muscles are warm. Just keep your expectations realistic, because the evidence that cooling down or stretching afterwards prevents next-day soreness is limited. Do it because it feels good and helps you switch off, not because it guarantees fresh legs tomorrow.

How does Edge build warm-ups into your training?

A warm-up should not be something you have to remember or design from scratch every time. With Edge, the warm-up and the mobility work are built into each session and matched to whether you are running, lifting or doing HIIT that day. Because Edge treats running, strength and HIIT as one plan rather than three separate apps, the preparation is tailored to the actual session in front of you, and your coach is a message away if a movement does not feel right.

This article is general guidance, not medical advice. If you are new to exercise, returning from injury, pregnant, or managing a health condition, speak to your GP before starting, and see a physio for any niggle that does not settle.