How can I help a friend on a 24 hour walk around a running track?? She's been walking since 10.30am, all through the heat of the day. I have a slot at 11pm to 1pm, accompanying her. She's already raised £24000. I think by 11pm she will be flagging in a serious way. How can I keep her going? I am not a natural coach, or a sports psychologist! I don't want to irritate her - I am very prepared to sit on the sidelines if she's happier alone. Just wondering if anyone can offer insight into how to motivate people doing these long-haul challenges.