The Bristol-based video content producer, whose family is from Cardiff, is raising money for rugby mental health charity LooseHeadz to help tackle the stigma around mental health.
"So far it's been amazing," he said, adding he has so far raised over £2,000.
Wales lost by six points to Scotland, seven points in Italy and nine points to Ireland, but suffered heavy losses against France and England, conceding 43 and 54 points in those matches respectively.
"I would have liked to have spread the pain over the games," Rhodri said. "I thought it would be more even."
Saturday's defeat brought his total number of miles to run up to 119.
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