In addition to sfb350 I also registered for the London Marathon yesterday, I must be mad!!!!
My 5 x 50 challenge experience has been mixed. Last week I was feeling very despondent as I still hadn't been running and I was finding it difficult to keep motivated. I have however found my mojo - Friday I needed to deliver a birthday card so delivered it by hand doing run/walk intervals so as not to put to much strain on my shins, ended up being an 8k round trip. Did another run on Saturday again run/walk intervals and again today I did a 5k run. Shins seem to be holding up but have been doing strengthening exercised which I will continue.