Steve Hunt, 44, is on day six of his challenge to run 60 half marathons in 30 days for Cancer Research UK.
Mr Hunt, from Christian Malford, said he is exhausted today, but his tiredness comes and goes in waves.
He said: "I only had four hours sleep last night because I woke up at 3.30am and couldn't get back to sleep before my alarm went off.
"I was up and about by 5am and my calves are getting more and more sore. I have a day off work tomorrow so I am going to use it as my sleep day and rest in the middle of the daytime."
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