The aim of the proposed project is to examine whether recovery after competition in horses is affected by housing system. Our hypothesis is that horses kept in a housing system where they can move freely in groups recover faster than horses kept in box stalls. We performed such a study in 2015 and, in the proposed project, we intend to perform further analyses of blood samples. The study was performed in a cross-over design with eight horses and two different treatments, that consisted of housing in active group housing and housing in box stalls. On two occasions per treatment, the horses performed an exercise test. Blood samples were collected to be able to document work intensity and effects on recovery (lactate), energy balance (NEFA, urea), dehydration level (TPP) and muscle cell damage (ASAT, CK). We expect the study to provide valuable information on how housing system affects the recovery of athletic horses. This information can be used in guidelines on good horse management.