Sam hope you have recovered, and yes you are completely right it was the giving blood that affected your run all to do with O2 transfer etc.. I know exactly what you mean about following plans it tends to bring out the OCD in me 
Daveo good luck with your pushups and situps, it should help with your running as it will aid developing a really good core strength. Good on your wife push ups are a killer!!
I too was attempting to stay off the alcohol until Feb, but fell off the wagon Saturday night with half a bottle of Rose - bugger!! will try and improve - but huge well done to those still on the straight and narrow.
Running wise week one of my goal to hit 1250 miles (2013k) in 2013 and 20 miles completed this week, mileage goes up slightly each week as I follow my HM training plan. Only 6 weeks to go before my first HM scary and exciting.
HM4 my vibram five fingers I only use for walking in at the moment (although I have done a couple of sprints in them) may wait until after the Brighton HM to allow for the proper transition. However my main running trainer are the saucony kinvara which are pretty minimal anyway - 4mm heel drop so hopefully it won't be too much of a shock to my calves/achilles. I also walk around my home barefoot all the time so fingers crossed... After a pilates class recently, i decided to run bak to my car completely barefooted - not sure whether its something that I would repeat, well not in winter anyway 
Pilates class for me later, must resist going out for a run today as ankle is a bit twingey from running on country roads yesterday - the camber really affects me, I must strengthen up my ankle muscles.
Happy running everyone 