Riding up hills is the ultimate challenge for a cyclist. It's the quickest way to gauge fitness levels, the best workout and then there's the reward of an exhilarating descent. This guide is a compilation of some of the best hills in Yorkshire and the Peak District. It's not a definite list of the Top 50 toughest climbs. Instead, author James Allen has selected some of the most iconic, the most thrilling, the most interesting and most varied - as well as the toughest - hill climbs that this region has to offer. Hopefully, there's something here for everyone, whether you're a 'Weekend Warrior' or a serious road racer. Just get out there and enjoy the ride.