Theguardian iconTheguardianAug 31, 2026

100 ultramarathons in 100 days: former rugby pro hit by brain injury nears end of feat

David 'Jacko' Jackson has aimed to raise awareness of brain injuries, with fellow runners sharing their stories The key for David "Jacko" Jackson is to take each stage nice and gently. Jackson, a former professional rugby player who retired after a traumatic brain injury, is nearing the end of an extraordinary bid to run 100 ultramarathons (50km, or about 30 miles) in 100 consecutive days.

100 ultramarathons in 100 days: former rugby pro hit by brain injury nears end of feat

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David 'Jacko' Jackson has aimed to raise awareness of brain injuries, with fellow runners sharing their stories The key for David "Jacko" Jackson is to take each stage nice and gently.

Jackson, a former professional rugby player who retired after a traumatic brain injury, is nearing the end of an extraordinary bid to run 100 ultramarathons (50km, or about 30 miles) in 100 consecutive days.

Slow and steady – and do it again tomorrow." So far, so good.

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David 'Jacko' Jackson has aimed to raise awareness of brain injuries, with fellow runners sharing their stories The key for David "Jacko" Jackson is to take each stage nice and gently. Jackson, a former professional rugby player who retired after a traumatic brain injury, is nearing the end of an extraordinary bid to run 100 ultramarathons (50km, or about 30 miles) in 100 consecutive days. Slow and steady – and do it again tomorrow." So far, so good.

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Slow and steady – and do it again tomorrow." So far, so good.

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