I recently started indoor group cycling also known as spinning as a cross training activity for running. I never thought I would like it, until I actually tried it. 2019 Update: I rediscovered indoor cycling as alternative, low impact and low risk activity during the third trimester of my pregnancy and absolutely love it. Spinning is actually a registered trademark name for indoor group cycling. However the concepts of other group cycling classes are quite similar: a group of people is cycling indoors on special watt bikes guided by an instructor. The instructor defines a basic program with a warm up, hills, intervals, maybe arm exercises and a cool down. The riders cycle to the beat of the music and adjust the resistance according to their own abilities. So why did I fall in love with spinning or indoor cycling classes?