Never enter a challenge that is dangerous, or if your current level of fitness or skill isn't sufficient for you to do it safely. Remember our Terms and Conditions - you enter challenges entirely at your own risk. If in doubt, consult your doctor before taking part (or don't join it)! Please report dangerous or offensive challenges using the flag button above

If you like this challenge but it's private, for people of a much higher or lower ability/fitness level, or you think lots of people are lying about their scores, don't forget you can easily create a similar challenge for a different set of competitors, or keep it private for friends who you trust to post honest scores. If you create your own challenge you'll be able to moderate all entries as well.