[badpun]

Tough physical labor is not for everyone. For example, I would not last 6 months in a construction job (I easily get colds when I work outside). As long as the majority of people working in that warehouse are ok, then maybe your friend was just not suited for the job.

[Ricardus]

This is not just about tough working conditions. It's about the way management treats employees, and encourages employees to crap on other employees for small gains. Google "I was a distribution warehouse wage slave" and read that article. It will get you a better idea of what I am talking about.