Should I stretch before lifting?

Not statically, and not for long holds. A static stretch held past 30-45 seconds measurably reduces force and power output in the muscle stretched, an effect that lasts up to an hour. Move the joints dynamically instead, leg swings, walking lunges, band pull-aparts, then save long static holds for after training or a separate mobility session.

How long should a warm-up take?

8-10 minutes for most sessions covers a general raise, targeted activation, and a short movement rehearsal. Heavy strength days need ramp-up sets on top of that, which adds another 5-8 minutes depending on the working weight. A genuinely time-poor day can drop to 5 minutes without losing the parts that matter.

Do I need cardio before lifting?

A short one, yes. Two to three minutes of easy cycling, rowing, or marching raises core and muscle temperature enough to make the rest of the warm-up more effective. It does not need to be a conditioning session of its own, just enough to get blood moving and a light sweat starting.

How many warm-up sets should I do?

For a barbell lift, four ramp-up sets is a reliable pattern: the empty bar, then roughly 40, 60, and 80 percent of the day's working weight, each for low reps. That sequence rehearses the movement pattern at increasing load and lets you arrive at the first working set warm, not pre-fatigued.

Is it bad to skip the warm-up?

For a hard session, skipping it costs you performance before the first working rep, since cold tissue and an unrehearsed movement pattern both blunt output. For an easy aerobic session, a full warm-up is unnecessary; starting slow and building into pace for the first 5-10 minutes does the same job.

Warm-Ups That Work: Dynamic Preparation for Lifting and Running

The static stretch you have been doing wrong

Holding a hamstring stretch for 30 seconds before a heavy squat session feels responsible. It is not helping, and it may be working against you. A static stretch held past roughly 30-45 seconds produces a measurable, if temporary, drop in the force and power the stretched muscle can produce, an effect documented consistently across a meta-analysis pooling more than 100 studies and still not reflected in how most people warm up. The effect fades within about an hour, so it is not permanent, but it lands at exactly the wrong moment if you do it immediately before working sets.

Static stretching also does not reduce injury risk in the way it is commonly assumed to. The evidence on pre-exercise static stretching and injury prevention has been consistent and unflattering for a long time: it does not move the needle, while dynamic preparation that raises temperature and rehearses the movement does. This is not a controversial or new finding, it has simply not filtered down into gym-floor habits.

None of this means static stretching is bad. It has a place, just not here. Long holds after training, or in a dedicated mobility session on a rest day, improve range of motion over time without touching same-session output. The fix is not to stop stretching, it is to move it to the right part of the week.

Worth separating out too: a warm-up prepares you for the session ahead, it does not prevent the soreness that shows up a day or two later. Those are governed by different mechanisms, covered in the guide on muscle soreness and training.

This guide covers what a warm-up is actually for, a plain-language framework that works for any sport, specific protocols for lifting and running, a 5-minute version for time-poor days, and who needs a little more than the baseline.

What a warm-up is actually for

A warm-up does four jobs, and a good one does all four without wasting time on any of them.

Raise tissue temperature. Warmer muscle contracts faster and more forcefully, and warmer connective tissue tolerates load better. This is the most literal meaning of “warm-up” and the easiest part to achieve, a few minutes of light continuous movement gets there.

Activate what the session needs. A squat session benefits from waking up the glutes and upper back before the bar goes on. A run benefits from waking up the calves and hip flexors. Generic full-body activation is fine, but activation matched to what is about to happen works better for the same time spent.

Rehearse the movement. The nervous system grooves a pattern through repetition, and a warm-up is the cheapest rehearsal available. Ramp-up sets before a heavy lift are not just about load tolerance, they are the last five reps of practice before it counts. The same logic applies to running strides before a hard track session.

Settle into the work. A warm-up shifts the body from a resting state into a working one, arousal, breathing rate, mental focus. Athletes who skip this step often report the first few minutes of a session feeling ragged even when the body is objectively ready. That settling-in matters as much as the physical readiness it usually gets bundled with.

The framework, in plain language

Most warm-up protocols in sports science literature describe some version of the same sequence: raise, activate, mobilise, then potentiate for the specific demand ahead. The acronym version of this gets thrown around a lot and tends to obscure more than it clarifies, so it is more useful to think about it as four questions in order.

Is my tissue warm. Am I moving the joints and muscles I am about to load. Have I rehearsed the pattern at low intensity. Am I ready for the first real effort. Answer those four in sequence and the specific drills matter less than getting the order right, because each step builds on the one before it. Skipping straight to rehearsal on cold tissue is where warm-ups fail, not from picking the wrong drill.

Lifting warm-up protocol

General raise, 2-3 minutes. Easy cycling, rowing, or a brisk walk on an incline. The goal is a light sweat and a noticeably warmer feel in the legs and back, not fatigue.

Targeted activation, 3-5 minutes. Pick two or three movements that match the day’s main lift. For a squat or deadlift day, glute bridges, banded lateral walks, and a few bodyweight good mornings. For a press or bench day, band pull-aparts, scapular push-ups, and shoulder dislocations with a light band or dowel. Ten to fifteen reps each, controlled, not rushed.

Ramp-up sets to the working weight. This is where the movement gets rehearsed at increasing load. A reliable pattern is the empty bar for 8-10 reps, then roughly 40 percent of the day’s working weight for 5 reps, 60 percent for 3 reps, and 80 percent for 1-2 reps. Rest 60-90 seconds between these, longer as the weight climbs.

Worked example for a 140 kg working squat: bar (20 kg) for 10 reps, 55 kg for 5 reps, 85 kg for 3 reps, 110 kg for 1-2 reps, then the first working set at 140 kg. Each jump is a manageable step, not a leap, and by the top of the ramp the joints have moved through the full range at real load without any of it costing recoverable fatigue for the working sets.

The point of the ramp is to arrive at the first working set warm, confident in the pattern, and primed, not tired. If the ramp-up sets themselves feel like work, the jumps are too large or there are too many of them.

Running warm-up protocol

Easy jog, 5-10 minutes. Genuinely easy, well below any target pace for the session. This is the raise phase doing its job, nothing more is being asked of the legs yet.

Dynamic drills, 3-5 minutes. Leg swings front-to-back and side-to-side, walking lunges, high knees, butt kicks, and a few controlled leg cradles for the hips. These mobilise the joints through the range they are about to use repeatedly and wake up the muscles around them.

Strides, 4-6 reps, before quality sessions. A stride is 80-100 metres building from easy to close to top speed, then easing off, with a walk-back recovery. Strides rehearse fast leg turnover and full extension in a way that jogging never touches, which matters directly before intervals, tempo work, or a race.

Easy aerobic runs need almost none of this. A slow first 5-10 minutes that gradually settles into pace does the same job as a structured warm-up when the session itself is low intensity. Reserve the full protocol, drills and strides included, for sessions with real intensity or a race on the line.

Race day is where this protocol matters most, because a cold start on race morning costs pace in the opening kilometre that is hard to claw back. Anyone building towards a first race should see the full warm-up sit inside the broader plan in the first 5k or 10k race guide, and marathon runners specifically should read how race-morning preparation slots into the final week in the marathon taper guide.

The 5-minute version for time-poor days

Not every session gets 10 minutes of preparation, and that is fine as long as the order is preserved. For lifting: 90 seconds of easy cardio, 90 seconds of the two most relevant activation drills, then two abbreviated ramp-up sets at roughly 50 and 75 percent instead of four. For running: a 3-4 minute easy jog folded straight into the first kilometre of the session, with pace building gradually rather than starting on target pace cold.

The 5-minute version drops volume, not the sequence. Raise before activate, activate before load, every time, even when the whole thing is compressed.

Team sport athletes face a version of this that is largely out of their hands, since a coach usually runs the warm-up before training or a match. Where an individual protocol still matters is the extra work squeezed in around fixture congestion, covered in the in-season training for team sports guide.

Cold mornings, early sessions, older athletes

Cold ambient temperature, an early wake-up, and age all point the same direction: more time raising tissue temperature, not a different protocol. A 6am session in winter can reasonably take 12-15 minutes to get through the same four steps that take 8 in warmer, later conditions, mostly by extending the general raise. Older athletes tend to need a longer raise phase and more activation reps for the same reason, joint and tissue temperature climbs more slowly with age. None of this changes what the warm-up is built from, it changes how long each part gets.

How Pelaris fits in

Every prescribed session in the workout tracker is built for warming into, not straight into. Strength sessions carry the working sets the ramp-up should lead to, and logging RPE per set gives the coach a signal if a session consistently feels harder in the first working set than it should, which often traces back to an under-done warm-up rather than the programming itself.

The Engine Room surfaces preparation content matched to what is coming up. A heavy squat day pulls up warm-up and activation guides in the prepare category. A hard interval session on the calendar does the same for running-specific preparation. The content shows up when it is relevant to the next session, not as a generic library.

The AI coach reads the session type and intensity when building the week. Ramp-up structure scales with the working weight the program has you at, and quality running sessions are flagged distinctly from easy ones, because they warrant different preparation and the coach knows which is which from the methodology driving that week’s plan.

The habit worth building

Warming up is not the part of training that gets skipped when the clock is tight, it is the part that determines whether the ten minutes after it count. Raise, activate, rehearse, then work. Do those four in order and the specific drills matter far less than most athletes assume. Skip straight to the working set on cold tissue and an unrehearsed pattern, and you are training with a handicap you chose yourself.