Uncontrolled muscle contractions are a common phenomenon in endurance and game sports. It often leads to a drop in performance and forces the athletes to give up the race or stop playing. Typical reasons are in many cases mechanical stress/overload, cold temperatures, dehydration as well as loss of energy and electrolytes. Scientific studies practised for many years confirm the usage of Mixed Pickle Juice. Sponser® MUSCLE RELAX is an adapted Mixed Pickle Juice solution based on scientific criteria with acetic acid, the bitter substance quinine and magnesium. Magnesium contributes to the electrolyte balance and normal muscle function.