You can design your 5050OCF challenge any way you'd like, but the basic idea is to get sponsored for covering a 50k distance (any way you like) over the month of July.
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As many of you are we lost Dad to Oesophageal Cancer just over 2 years ago.
We haven't done much running in the last few years but the plan is for us both to run 50 K in July for this worthwhile charity, in the hope it could help someone else.