It is easy to hurt your back, or to suffer a repetitive strain injury when you are: 

• carrying piles of plates;
• pushing or pulling trolleys;
• bending to pick up objects;
• balancing trays; 
• lifting baskets of dirty dishes; 
• reaching over counters and hot boxes;
• stretching across tables; and
• leaning through a drive through window to serve customers.

• Use smaller trays and baskets.
• Don't carry too many plates and glasses at a time.
• Use a waiter's cloth to protect your arms when carrying hot plates or trays.
• Ask your employer to install outdoor tables and chairs permanently, so you don't have to set them up and pull them down every day.
• Ask your employer to re-design drive-throughs so you don't have to stretch across counters or lean through windows.