We do our very best to weed out any cheating by asking people to evidence their challenge attempts. However, due to the nature of this being an online challenge series, it's not 100% fool proof.
We have to take everyone's submissions at face-value. If we can confidently identify people either cheating or doing the challenge incorrectly by accident, we will notify the competitor privately via email.
At the end of the day, the leaderboard is just a bit of competitive fun. These challenges are personal tests of resilience. If people decide to cheat, they're only cheating themselves. If you concentrate on yourself and give your best honest performance then you can hold your head high at the end of the day.