Listen DJ, i speak from experience when talking about 'TOO FAR TOO FAST'. Two years ago i upped my long, slow run one sunday from 13 miles to 20, yes 20 (i got lost, different story!) As a result i tore a ligament in the back of my left knee but i was fortunate that the physiotherapist i went to was really good but a knock on effect occured (see my posting about physio exercises). When i got back into training i did little 3 milers three times a week and biked three times (8 miles) with a 1 mile swim on saturday then added 1 mile per run thereafter and now i'm back to 13 mile on sunday without the same injury so take your time and most of all, dont try to be an instant athlete like i did, enjoy it!!