Went out for run 2 of week 2 this evening and found it a real struggle. Kept it slow but felt like I was losing momentum. However, I couldn't have run any faster from a breathing point of view. Lower legs felt really heavy and ached particularly just above ankle/ lower calf. Hope this gets better. On my way round I was thinking that I might need to repeat this week. My husband assures me it will get easier - I certainly hope it does.