Isaac is six months into a year-long surfing challenge to raise money for BBC Children in Need.
Ruth Hitchcock, from Cornwall, completes the swim, raising awareness of neuroendocrine cancer.
Nigel Howell's previous brick-carrying feats include climbing Mount Kilimanjaro and the Three Peaks.
Ann Bowditch and Dr Graham Beck cycle from Lands End to John O'Groats and raise funds for charity.
Hugo and Anya Sousa take on the Peak District Ultra Challenge in memory of their son Leo.
John O'Groats sits on Scotland's north-eastern tip and Land's End lies in the far west of Cornwall.
The group has raised more than £20,000 for a neonatal care charity in the last 10 years.
Mark Christian buried his symptoms for years but says he is "no longer ashamed" of his condition.
The community has raised thousands to help pay for repairs as released chickens lost to fox.
