After taking two days off and icing my calf I tried to have another run. About 1km in I could start to feel it pulling tighter and then just stopped before it became too irritated. Went and saw Damien in the afternoon and got some very deep and painful ART massage done. Seems to think that the muscles (soleus and posterior tibialis) are just stuck, maybe a slight tear. He has recommended another two days rest at least.
Day 4: 63 pushups