The Physical Reality of Teaching (That Nobody Mentions in Training)

At some point in your first year, you will come home on a Thursday and feel more tired than you have felt after any previous activity in your life, including physical exercise. You'll sit down on the sofa and not be able to explain why your whole body aches. You haven't done anything physically strenuous. You've been inside a room with thirty children.

This is the physical reality of teaching, which nobody in training really explains.

What your body is doing all day

You are on your feet for most of the day. Six to seven hours of upright, mobile time — moving around the room, crouching to help children, standing at the board, sitting briefly and standing again. This is more sustained physical load than a desk job, and more than most people realize when they imagine teaching from the outside.

You are managing your voice constantly. Projection, variation, lowering for quiet moments, raising for instructions — your voice does enormous work in a teaching day. In your first year, before you've developed efficient technique, you're probably using far more energy on this than experienced teachers do.

You are processing social information at high speed. Thirty children's faces, body language, responses, interactions with each other — your brain is running a continuous social awareness scan that is genuinely cognitively expensive. This is part of why teaching exhaustion feels so total. It isn't just your legs.

You are making hundreds of decisions per hour. When to move on, who to ask, how to respond to that answer, whether the noise level is acceptable, whether that child in the corner is disengaged or tired, whether the transition is going to run over. Decision fatigue is real, and teaching produces it in abundance.

Your voice

Voice problems are one of the most common reasons teachers take sick leave. The teaching voice is used differently from the social voice — more projected, more sustained, more controlled — and most people start teaching without any training in how to use it efficiently.

A few things that protect your voice:

**Don't compete with noise.** The impulse when a class gets loud is to raise your voice. This is the thing that damages vocal cords most quickly. Use a signal — a hand raised, a specific word, a countdown — that establishes quiet before you speak. Save your voice for when they're listening.

**Don't project from your throat.** Project from your chest and diaphragm. This is a technique, not something most people do naturally. If your voice feels strained by lunchtime, you're projecting incorrectly.

**Hydrate constantly.** Keep water on your desk. Drink it. Particularly before long periods of whole-class teaching.

**Rest your voice during breaks.** Staffroom conversation is fine, but a brief quiet moment where you're not talking does real work for your voice over a year.

If you find yourself consistently hoarse or losing your voice, mention it to your doctor before it becomes a chronic issue. Many teachers develop vocal nodules that could have been avoided with earlier intervention.

Your feet and back

Six hours on your feet per day means approximately 10,000–15,000 steps, plus the static standing. This is physically demanding, and most people enter the profession wearing whatever shoes they wore before.

Buy proper shoes for teaching early in your first year. Proper arch support makes an observable difference to how you feel by 4pm. This isn't optional self-care — it's maintenance of the equipment you need to do the job.

Your back: the habit of bending at the waist to help seated children is almost universal and very bad for your lower back over time. Get into the habit of crouching or kneeling rather than bending. It takes longer to establish but saves you considerably on the years-long calculation.

Sleep and the teaching brain

The adrenaline economy of teaching — particularly in the first year — does strange things to sleep. You're exhausted by 9pm but your brain is still processing the day. You lie down and the lesson that went wrong at 2pm replays. You think of things you should have said. You run through tomorrow's lesson.

A few things that help:

**A hard cut-off time for school thinking.** This isn't always achievable, but aiming for a time after which you don't open school email or planning documents is worth trying. Some people use a physical signal — putting their bag in a specific place, writing a brief tomorrow-list to empty their working memory.

**Physical activity of any kind.** The teaching brain is full of social and verbal processing. Physical activity that requires physical attention — walking, swimming, anything where you have to pay attention to your body — provides a genuine neural switch. It doesn't need to be ambitious.

**Don't sleep with planning on your mind.** If you have an unfinished task that's going to keep you awake, spend ten minutes making it 'finished enough' — a note of exactly where you stopped and what the next step is. Your brain can let go of a task that's been parked more easily than a task that's unresolved.

The energy budget

You have finite energy. In your first year, you probably don't know how much you have. Most first-year teachers find out by running out.

Teaching sustainably means managing your energy budget consciously. This doesn't mean lowering standards — it means being strategic about where you spend effort. A beautiful hand-drawn display takes hours and has essentially zero impact on children's learning. A simple, readable display that goes up quickly is more rational.

The question to ask about any task is: 'What would be good enough here?' Not 'what would be optimal.' Optimal is the enemy of sustainable.

You cannot give children everything they need if you have nothing left. This isn't a pleasant observation but it's true. The teachers who are most reliably effective are not the ones who run themselves into the ground in October. They're the ones who managed their energy well enough to still be effective in March.