The brain is the most important muscle for climbing. (W. Güllich)

In this week's competition you've got the chance to win a copy of Mastermind, the new climbing psychology book from Jerry Moffatt.

Utilising the power of your mind will make the most of your existing strength, techniques and ability to perform under pressure not just in climbing, but in all sport. Jerry Moffatt, who inspired generations of climbers, invites you to explore and maximise your mental potential with the help of this beautiful book. Mastermind also contains a collection of inspiring stories from the current elite of the sport. Legendary figures such as Alex Megos, Adam Ondra, Margo Hayes and Chris Sharma reveal their innermost thoughts that help them perform at their best.

Mastermind invites you to improve your psychological game by providing you with sports psychology based on the experience of Moffatt and other successful climbers, and then giving you the space to note down your own areas for improvements and strengths. This formula ensures that you're not only reading about how to improve mentally, but that you're also practicing and learning it. Through a triumph of graphic design, the book is naturally broken up in to sections, quotes and action points which make it accessible to anyone interested in the mental side of climbing.

For your chance to win simply answer the question below: