Did it for two years.
How’s your stamina?
If you don’t work out, or have done labor intensive work before, you’re gonna feel like shyt. Every part of you will hurt until you get used to it, then you’ll only feel it when you stop for the day.
While training focus on building. The less you have to adjust the cases on the pallets, the faster you’ll complete them.
If you getting paid per case, time is money (Here’s where knowing how to build comes into play).

You want that shyt stable, while you maneuver through that warehouse and 30 other wolves all trying to get it. Cause if you spill ya shyt, they might help you pick it up,

or they might drive through it.