I've been using trainerize for a few months now and the step counter accuracy when synchronising through any of the existing integrations is poor to say the least.

On a daily basis, the step counts are at least 1,000 to 1,500 steps inaccurate under quoting how many steps I've done when comparing with the external app, such as Fitbit or MyFitnessPal. In the most extreme case I completed 24,000 steps and the app only quotes me as having done 14,000. I have a great level of trust with my trainer and can share additional details with him, but this is simply poor from an app product perspective.