Low drop-out rates in the HandbikeBattle free-living training study: understanding the reasons for dropping out.

Study Design: Longitudinal observational study.

Objectives: During the five-month free-living training period for the HandbikeBattle event several participants dropped out. The aim of this study was to clarify the numbers and reasons for drop out, and to characterize the differences between study participants who did (dropouts) and did not (competitors) drop out during the training period for the HandbikeBattle event.