In an editorial published in the Sports Biomechanics journal, we outlined the key challenges and technology available to determine body position on the bicycle. This is a critical outcome for bike fitting and involves the use of different tools and methods. Simpler options normally require a manual goniometer or an inclinometer whilst more sofisticated alternatives require a three-dimensional analysis of movement. The main challenge was the limited research assessing inter-session reliability, which is required to measure change during multi-day interventions. In bike fitting, you normally prescribe changes that will require re-assessment in a few weeks. This design is only valid if the choice for determining posture is reliable across multiple days. Moving forward, standardizing the testing protocol (i.e. cadence, intensity, etc) will be critical to ensure that motion and posture are reliable.