1.) Buy a bound longsword spell from the mages guild in balmora.



(You can buy bound longbow, mace, or anyother weapon spell you want depending on the skill you want to raise)



2.) equip the bound longsword spell to be used



3.) Drop all weapons in your inventory except for 1 weapon



4.) Cast bound longsword (if it doesnt cast just go rest and try again)



5.) Once it is casted press and hold right trigger, left trigger and x it will make some funny sound over and over and your longsword skill will go up the longer you hold it.