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Jamie Laing vs Spencer Matthews' Ultra Marathons: A look inside the battling buddies' gruelling training regimes and very different inspiration

Here MailOnline looks inside the battling buddies duelling journeys.....

Jaime Laing (L) has finished an Ultra Marathon for Comic Relief, just just seven months after his pal and former MIC co-star Spencer Matthews (R) undertook a similar challenge As well as running an impressive 30 kilometers a day, the TV star also endured working out in a heat chamber with temperatures of up to 50 degrees Celsius so that he could acclimatised to the marathon conditions. The heat chamber, which he visited at the London South Bank University, stimulated the exact conditions of the desert challenge, with Spencer training in high temperatures with 20% humidity.

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