Recovery after training or races is a complex, multi-level process. This is dependent on the training state, athlete’s age, and the length and intensity as well as the type of stress. This complexity defines the individual time needed for the recovery process. Indeed, different biological subsystems exhibit different times needed for recovery. The metabolites produced during intense activity, such as lactate, are as a rule metabolized and broken down within a few hours. The rebalancing of the water and electrolyte balance depleted by sweating is usually completed within 6 hours. In contrast, replenishing energy stores (glycogen) can last longer (1-2 days) Other subsystems can demand up to 8 days for full recovery. After more intense, depleting ski mountaineering races, ultra marathons or intense mountain runs, recovery time can of course be much longer and demand even several weeks. To accelerate the recovery process, various active and passive measures can be used.