I wouldn't say fast paced is backbreaking work. I work fast food and during lunch time it's normally always busy. Sometimes I take the orders out and in that case get crap from the customers sometimes as well as trying to get the food out as fast as possible. Sometimes I work fries, and in that case get fries up and they are all gone within a minute at most... Then I have to constantly put other stuff down as well, so I then get behind on the fries... Fast paced is frustrating, but not backbreaking. I've gotten burnt on the fry station by the heat lamp, the vat oil (350 degrees F), the grill grease, and other stuff such as hot things that just came out of the fry vat. I get $7.70 and am working 8 hours a day, 5 days a week.
I've been there when we were way understaffed and we got hit bad. The stupid manager thought it would be a good idea to let people go home early to help the labor, but it sure didn't help us when we got hit. Then the people that are there continue to just stand around...