you can look up agility on the AKC site, which gives you all the rules/regs/obstacle specs etc. I've never seen threadles in AKC agility..
Back side jumps? Not sure what you mean? Are you talking about back jumping a jump? usually if you jump a jump backwards, it's an off course/DQ..
Danger Danger vom Kleinen Hain aka Masi
"Angel" Jakoda's Bewitchen Sami CD OA OAJ OAC NGC OJC RS-O GS-N JS-O TT HIC CGC
"Angel" Steinwald's Four x Four CGC HIC TT
Harmonyhill's Hy Jynx NA NAJ NAC NJC RS-N JS-N HIC
Jakoda's Jagged Edge