I don't want to give too much away but it's just moving things to where they need to go. Walking everything over to its correct container would take too long so you toss what you can and only carry the super heavy stuff. I most likely wouldn't actually throw something that is 50 lbs but if it is 10 or 15 it isn't a big deal to pitch it a few feet. Doing that and carrying the odd heavy thing for 8 hours isn't super easy on a good day. The pay is pretty good though.