(L-104 days) In his latest video blog, ESA astronaut Andreas Mogensen is at the European Astronaut Centre in Cologne, Germany, learning about MARES - the Muscle Atrophy Research and Exercise System - a piece of equipment that he will get to use on the International Space Station.

Andreas is currently training for his 10-day Iriss mission to the ISS, set for launch in September 2015.

Connect with Andreas at http://andreasmogensen.esa.int