During the Daedric Quest at the Shrine of Molag Bal, once Melus Petilius attacks you, stand and let him hit you repeatedly. Don't let him kill you though.
Once your health starts to drop, use Restoration magic to heal yourself.
You can yield at any time to repair your equipment and then punch him again to get him to attack you again.
Repeat until you have 100 for Restoration, Block, Light Armour, Heavy Armour and Armourer.