Why your warm-up is probably too short (and what to do about it)

There is a moment I have watched repeat itself so many times that it has become almost meditative to observe: the clock ticks to the session start, someone finishes lacing their shoes, and they immediately load a barbell. No joint circles, no temperature rise, no tissue preparation — just cold muscle against iron, and a quiet optimism that nothing will go wrong. It almost never goes catastrophically wrong, which is exactly why the habit persists. The cost of a too-short warm-up is rarely a dramatic injury; it is something quieter and more insidious — a first set that feels like wading through concrete, a shoulder that nags for three days without ever quite explaining why, a training session that never quite lifts off the ground. I have been coaching group strength sessions long enough to have developed strong opinions about this, and what follows is an attempt to lay them out honestly.

The two minutes of cardio problem ¶

The most common warm-up I see in group fitness settings goes something like this: two minutes on the rowing machine or bike, a brief set of arm circles that looks more like semaphore than shoulder preparation, and then straight to the working weight. The person doing this is not lazy — they have shown up, which is more than most — but they are asking their neuromuscular system to do something it is genuinely not ready for. Core temperature takes longer than two minutes to rise meaningfully, synovial fluid in the joints needs time and movement to become viscous enough to protect cartilage surfaces, and the motor patterns required for a heavy squat or a deadlift are patterns the nervous system needs to rehearse before loading them seriously.

What this costs is subtle. A cold first set of back squats tends to be technically worse than the second and third — the hips feel restricted, the thoracic spine is stiff, and the lifter compensates in small ways that accumulate over months of repetition. None of this shows up as a single acute incident. It shows up as the kind of chronic tightness that people describe as 'just how my body is,' when in fact it is how their body is after years of insufficient preparation.

Why group settings make this worse ¶

There is a social dimension to the problem that coaches do not talk about enough. In a group session, the warm-up is often the period of lowest social stakes — people are chatting, settling in, recovering from the commute. The coach is taking attendance or writing the workout on the whiteboard. Nobody is watching the warm-up with the same attention they bring to the working sets, and so it becomes the part of the session that quietly erodes.

There is also a mimicry effect. If the three most experienced members of a class skip the warm-up — or condense it to something perfunctory — newer members read that as permission to do the same. Experience, paradoxically, sometimes makes this worse: the person who has been training for six years has accumulated enough motor pattern memory that their first set looks fine, and so the newcomer who copies their approach pays a cost that the experienced lifter has partially insulated themselves against through years of accumulated adaptation.

I have also noticed that class formats which promise a lot — a strength block, a conditioning piece, some accessory work — create implicit pressure to get to the 'real' training quickly. The warm-up starts to feel like an obligation to discharge rather than a process to complete. This is a framing problem, and it begins with how coaches talk about the warm-up, which is often as an afterthought tacked onto the start of a session rather than as the first working set of the day.

What a ten-minute warm-up actually looks like ¶

Ten minutes is not a long time, but it is enough if it is structured deliberately. The framework I use with group sessions at Grit Blend Zone divides the ten minutes into three phases that build on each other: a general phase to raise temperature, a mobility phase to open the ranges of motion the session will demand, and a specific activation phase to wake up the exact patterns the working sets will use. Each phase has a job, and each phase informs the next.

The general phase — roughly three minutes — is aerobic and continuous. A moderate row, a light bike, or a jogging circuit works. The point is not to exhaust anyone; it is to raise core temperature by approximately one degree Celsius, which research in exercise physiology suggests meaningfully improves both muscle contractile force and connective tissue extensibility. Three minutes of genuine movement, not gentle strolling, achieves this. The mobility phase — four minutes — is where most coaches make their second big mistake, which is choosing generic stretches rather than session-specific ones. If the session involves Romanian deadlifts and a pressing movement, the mobility work should prioritize hamstring length, hip hinge range, and thoracic extension — not a general yoga sequence that covers everything and prepares nothing specifically.

• Minutes 1-3: continuous aerobic movement at a talking pace — row, bike, or light jog
• Minutes 4-5: dynamic hip flexor and hamstring work (leg swings, hip circles, walking lunges with a reach)
• Minutes 6-7: thoracic mobility and shoulder preparation — cat-cow, thread-the-needle, band pull-aparts if available
• Minutes 8-9: two sets of the session's main movement pattern at 30-40% of working weight, focusing purely on technique
• Minute 10: one set at 60-70% of working weight — this is the bridge to the first real set

The specific activation phase is where preparation becomes preparation ¶

That last phase — the movement-specific activation — is the part most group sessions omit entirely, and its absence is felt most acutely by anyone over thirty-five whose joints take longer to find their groove. Doing two light sets of the day's primary movement is not the same as warming up for that movement; it is the final step in a process that makes those light sets actually useful rather than merely ceremonial.

When I program this correctly, the first working set of a session at Grit Blend Zone feels, for most members, indistinguishable from the second or third in terms of technical quality. The hips are open, the lats are engaged, the pattern is loaded in the nervous system. That is the goal — not to arrive at the working weight feeling fresh in spite of the warm-up, but to arrive feeling tuned.

The warm-up is not the price of admission to the session — it is the first working set, and it deserves the same attention as the rest.

Seasonality matters more than most people admit ¶

This is something I have become more insistent about as the years go on, particularly in the colder months. Walking into a gym in the middle of a cold snap — the kind that settles over the city in July and August when the wind off the coast comes in hard — and expecting the body to perform as it does in the warmer months is an optimistic position. Muscle tissue is more viscous in the cold, and joints that are already prone to stiffness become genuinely restricted. The ten-minute framework I described above becomes a twelve-minute framework in winter, with the general aerobic phase extended and the mobility work done more slowly.

Conversely, in summer, some members arrive already warm from the commute and can move through the general phase more quickly, spending more time on the activation work. The warm-up is not a fixed protocol; it is a responsive one, and a good coach reads the room — and the season — before deciding how to structure it.

What coaches can actually do about it ¶

The structural solution is simple enough to state and harder to execute consistently: build the warm-up into the session plan with the same specificity as the working sets. That means writing it on the whiteboard, timing it explicitly, and treating deviation from it the same way you would treat someone skipping their third working set — as something worth a quiet conversation. At Grit Blend Zone we started doing this about eighteen months ago, programming the warm-up movement by movement rather than leaving it as 'ten minutes of whatever,' and the effect on session quality was noticeable within a few weeks.

The less structural solution is about language. When coaches frame the warm-up as the first chapter of the session rather than the cover page, members engage with it differently. This is not a motivational reframe — it is an accurate one. The warm-up is training. The adaptation that occurs during a careful, progressive warm-up is real, even if it is not the kind that adds kilograms to a one-rep max. Treating it as such, consistently and in public, is the most durable change a coach can make.

There is also something to be said for doing the warm-up alongside the group rather than narrating it from the sidelines. Members who see a coach moving through the same hip circles and light sets take the process more seriously — not because of authority, but because of visibility. The coach's body is evidence. It is doing the thing, in real time, which is about as clear a signal as a group setting can produce.

We are in the middle of the winter block at Grit Blend Zone right now, which means the 6am sessions start in the dark and most members arrive with cold hands and stiff thoracic spines. The ten-minute warm-up, done properly and in full, is the difference between a session that never quite fires and one that does. The barbell can wait an extra eight minutes.