Think of it as continuous sewing .... something is always sitting in the machine.
Had never seen IceBlossom's "spider" term before, but I totally get it and like the term!
I guess I "do" spiders more-so than leaders/enders ...
I just aim a folded over small scrap under the machine and stitch though in no particular pattern.
And keep re-using it over and over til it's a hairy mess.
Sometimes I trim the hairs off and keep using it a while longer!