Amphibian wrote:I have no idea mate sorry. And don't worry, not all of us here are arse biters..

Keep your sexual preferences to yourself.
As for PSS(R), that's Physical Selection Standard (Recruit). No idea what the other random letters mean but as you have to do a static lift, jerry can carry, press-ups and chin ups, as well as a run I imagine they are all related ......but some well paid individual has decided to put it in 'military speak' and also in abbreviations to confuse everyone. Incidentally, I very much doubt that the SL: 25 means you only have to static lift 25kgs (as your question on the Ars$e website infers) 25kgs is about four Big Macs.. I think most people can lift 25kg without noticing so it isn't much of a physical test.
EDIT to add: Mind you, we are talking 'RMP fitness' which is a bit of an oxymoron, so perhaps 25kgs is at the upper end of the phys brackets for those fine specimens..........