Pro tip: the old rigger who said to bounce the load before every pick was onto something
I laughed when he said it on that grocery store job in Toledo last month, but after watching a 2,400-pound truss settle a full foot on the first test lift, I bounce every load now, so tell me I'm not the only one who does this little routine.
Bouncing it is basically a free check that everything is hooked right before you put real tension on it. That truss dropping a foot was the rigging telling you something was loose, and the bounce caught it while the load was still low and slow. Do it on every pick, even the little ones, because the day you skip it is the day the sling is twisted or a pin is half in. Cheap habit, and it costs you two seconds.