The book only gets you to 70, after that you have to run around in armor heavier than your max allowed. You have to have the encumbered debuf. Once you reach 100 armor training, you can start reading heavy armor training.
Yes, just put on armour heavier than your max armour weight, and sprint and jump around in circles non-stop until you run out of stamina. Then wait for your stamina to return to full, and rinse and repeat.
Just find a spot where there is a small step, and your char stutters in place when in autorun. Leave him there stuttering for a few hours and its all levelled up.