I was an off-street hire, and I'll easily admit I was in the right place at the right time (after applying unsuccessfully on and off for a decade).
But, I had ten years of truck driving experience when I did get hired. I went to the week-long UPS driving class, and a month later I actually started.
Haven't stopped working since.
It's true, this job isn't for everyone, but it's not rocket-surgery, and if you have a can-do attitude you can make it work.
Oh, and if you can acclimate to the physical nature of the job...not everyone can. If you're not used to the sheer physicality of this particular work, the learning curve is steep.
But, after not too long, you'll be busting 350lbs on a hand-truck up a curb like you're a boss.
(Physics is your friend).
Like Upstate says, work smarter, not harder...[emoji6]