Checkouts, cashiers and repetitive work

A checkout looks like light work. Nothing a cashier lifts is very heavy, and the job is done standing in one place. But a busy grocery cashier may scan and bag well over a thousand items in a shift, reaching, grasping, lifting, twisting and turning with the same arm hundreds of times an hour. Over weeks and months, that repetition can injure the tendons, nerves and muscles of the hands, wrists, shoulders and neck. Add long hours standing on a hard floor, cold drafts from the doors and the occasional heavy case of water, and the checkout becomes one of the main sources of musculoskeletal injuries in a store. This lesson covers how checkouts injure people and how layout, equipment and work organization prevent it.

How repetitive work injures the body

HSE-107 explains musculoskeletal disorders in detail. They develop when tissues are loaded repeatedly without enough time to recover. The main risk factors are repetition, force, awkward postures such as bent wrists or raised arms, holding the same posture for a long time, contact pressure from hard edges, and cold. Early signs include aching, stiffness, tingling, numbness or weakness, often worse at the end of a shift or at night. Common checkout injuries include tendinitis in the wrist and forearm, carpal tunnel syndrome, shoulder strains from reaching across the counter, and neck and low back pain from twisting and standing.

These injuries are easiest to treat and fix when they are caught early. A cashier who notices tingling in the fingers after shifts should report it, not wait until it keeps them awake at night. Northfield's cashier with wrist tendinitis last year had noticed soreness for several weeks before she said anything, by which time she needed several weeks on restricted duties.

The checkout workstation

Most checkout injuries are set up by the design of the workstation. Good checkout design follows a few simple ideas.

• Keep frequent reaches short. The scanner, the bagging area and the payment terminal should be within easy reach, so the cashier does not have to stretch across the counter or lean forward.
• Keep work at about elbow height. Counters that are too high force the shoulders up; counters that are too low force the back to bend. Adjustable platforms or counters help people of different heights.
• Let products slide rather than lift. A powered belt brings items to the cashier, and the scanner is placed so items can be slid across it rather than lifted.
• Avoid twisting. The bagging area should be in front of or beside the cashier, not behind, and the cashier should be able to turn with their feet rather than their back.
• Leave heavy items in the cart. A handheld scanner lets the cashier scan cases of water, bags of pet food and other heavy items without lifting them onto the counter.

Standing all shift

Standing for long periods on a hard floor causes tired legs, sore feet and low back pain, and over time it is linked with circulation problems in the legs. Standing still is harder on the body than walking, because the muscles are not pumping blood back toward the heart. Good controls include anti-fatigue mats with bevelled edges that do not curl, supportive footwear, a footrest or rail that lets the cashier shift weight, and the option to sit or lean.

Many cashiers in Europe work seated, and seated or sit-stand checkouts are becoming more common in North America. In California, the state's wage orders require suitable seating when the nature of the work reasonably permits it, and the California Supreme Court's 2016 decision in Kilby v. CVS Pharmacy said courts should look at the tasks done at a particular location rather than the whole job, which led many retailers there to provide seats at checkouts. Washington has no equivalent general seating rule, but a sit-stand stool at each checkout is a low-cost control that many cashiers value.

Handling heavy and awkward items

Most items a cashier handles are light, but a few are not: cases of water, large bags of dog food, cat litter, flats of soft drinks, watermelons and bags of soil in the spring. Lifting these from a cart onto the belt and then into a bag or back into the cart, with a twist, is exactly the kind of lift that injures backs and shoulders. Northfield's checkout procedure says heavy items stay in the cart and are scanned with the handheld scanner. Customers are asked to leave them in the cart, and a sign at the start of the belt explains why.

Bag weight is another issue. Heavy bags are hard on the cashier who lifts them into the cart and on the customer who carries them. Spreading heavy items across several bags, double-bagging when needed and not overfilling reusable bags all help.

Self-checkouts

Self-checkouts move scanning work to customers but create new tasks for the attendant: walking between stations, bending to fix errors, reaching into bagging areas, checking ID for age-restricted items and dealing with frustrated customers. Attendants may stand for long periods with little chance to sit. Store layouts should give attendants a podium or stool, clear walkways between stations and a way to call for help. Conflicts with customers over theft checks, age verification or machine errors are a common source of aggression; HSE-341 covers how to handle them safely.

Cold, drafts and the work environment

Checkouts are often near the doors, so cashiers can be exposed to cold drafts every time the doors open in winter. Cold makes hands less nimble and increases the risk of strains. Air curtains, vestibules, heaters at the checkout, and allowing warm layers or fingerless gloves all help. Lighting should allow the cashier to read screens and labels without glare, and the constant beeping of scanners can be turned down where store systems allow it.

Rotation, breaks and pace

Even a well-designed checkout involves a lot of repetition, so work organization matters. Rotating cashiers between the checkout and other tasks, such as front-end tidying, stocking light items, customer service or helping at self-checkout, gives the hands and shoulders a rest. Short breaks spread through the shift are better for recovery than one long break. Scan-rate targets, if used, should be set at a pace people can sustain without rushing, and should not count against cashiers for leaving heavy items in the cart or helping customers.

The program below estimates how much a cashier handles in a four-hour block at the checkout, with and without the handheld-scanner rule for heavy items.

# Rough estimate of the load handled by a cashier in a 4-hour block (US units).
items_per_min = 18          # average scanning pace on a busy shift
minutes = 4 * 60 * 0.75     # 75% of the block spent scanning
avg_lb = 1.3                # typical item weight
heavy_share = 0.03          # share of items that are heavy (cases, bags)
heavy_lb = 24.0             # typical heavy item weight

items = items_per_min * minutes
light = items * (1 - heavy_share)
heavy = items * heavy_share
lifted_all = light * avg_lb + heavy * heavy_lb
lifted_rule = light * avg_lb          # heavy items stay in the cart
print(f"Items scanned:            {items:,.0f}")
print(f"Heavy items:              {heavy:,.0f}")
print(f"Weight handled, no rule:  {lifted_all:,.0f} lb")
print(f"Weight handled, rule:    {lifted_rule:,.0f} lb")
print(f"Reduction:                {1 - lifted_rule / lifted_all:.0%}")

Items scanned:            3,240
Heavy items:              97
Weight handled, no rule:  6,418 lb
Weight handled, rule:    4,086 lb
Reduction:                36%

Even though only 3 percent of the items are heavy, they make up over a third of the weight handled. Leaving them in the cart removes about 2,300 lb of lifting from each four-hour block, and it removes the most awkward lifts. The numbers are rough, but the lesson is robust: a simple rule about heavy items does more for a cashier's back than any amount of advice about posture.

Customer service desks, returns and lottery counters

Not all front-end work is at the checkout. Customer service desks handle returns, which can mean lifting bulky or heavy items over a counter and carrying them to a return cart. Counters should have a low section or a gate so heavy returns can be passed through rather than lifted over, and a cart should be kept beside the desk. Lottery, tobacco and pharmacy counters often involve reaching up to locked cabinets or down to low drawers many times an hour, so the most frequently used stock should be kept between waist and shoulder height. Front-end workers also handle cash, which links checkout work to robbery risk; cash limits, drop safes and robbery procedures are covered in HSE-341.

What cashiers can do

Cashiers cannot redesign their checkout, but they can do a lot within it. Adjust the platform or stool if one is provided. Stand close to the counter and slide items rather than lifting them. Turn with your feet. Use the handheld scanner for heavy items and ask customers to leave them in the cart. Keep wrists straight and avoid pinching heavy items between thumb and fingers. Shift your weight, use the footrest and stretch between customers. Wear supportive shoes. Report early symptoms such as tingling, numbness or aching that lasts after the shift.

For supervisors: checking a checkout

Watch a cashier work for ten minutes at a busy time. Count how often they reach beyond the edge of the counter, twist to bag, lift heavy items or lean forward. Ask whether the mat curls, the stool is used, the handheld scanner works and the bagging area is in the right place. Small changes, such as moving the payment terminal closer or replacing a curled mat, can be made the same day. Check rotation schedules and make sure breaks are actually taken during busy periods.