Professional athletes are said to be seeking mental health help in record numbers. More than ever before sportspeople have been speaking out on their struggles to cope with the pressure that comes with competing at an elite level. Here's what Serena Williams, Clarke Carlisle, Kevin Love, Kelly Holmes, Michael Phelps and many others have said about mental wellbeing over the years.

In the UK, Samaritans can be contacted on 116 123 or email jo@samaritans.org. In the US, the National Suicide Prevention Lifeline is 1-800-273-8255. In Australia, the crisis support service Lifeline is 13 11 14. Other international suicide helplines can be found at www.befrienders.org.